时间:2019-01-07 作者:英语课 分类:健康与环境


英语课

HEALTH REPORT – December 11, 2002: Mercury 1 Levels in Fish


By George Grow



This is the VOA Special English Health Report.


Two studies are adding to the debate about the health risks of eating fish containing high levels of the metal
mercury. One study suggests that people who eat fish high in mercury may increase their risk of having a heart
attack. Yet another study found no link between mercury and heart disease.


Both studies were published in The New England Journal of Medicine in November.


Mercury is a natural element. Some bodies of water have become polluted with mercury. High levels of the metal
have been found in large fish, such as king mackerel, shark and swordfish. Scientists say mercury can be harmful
to people. For example, it can harm the developing brain of a fetus 2 or child. So some experts say that pregnant 3
women should avoid eating fish containing high levels of mercury.


However, the American Heart Association and other experts have advised Americans to eat fish at least two
times a week. Fish contains important substances, including omega-three fatty acids. These are believed to reduce
the risk of heart disease.


Scientists at the Johns Hopkins Bloomberg School of Public Health in Baltimore, Maryland organized one of the
new studies. They examined medical records of more than one-thousand-four-hundred men from Israel and eight
European countries. They compared men who had suffered a heart attack with healthy men.


The scientists examined mercury levels in the men by studying toenail particles from the men’s feet. The study
found that mercury levels in the men who had a heart attack were fifteen percent higher than those with no
history of heart disease. It also showed that men with the highest mercury levels were about two times more
likely to have a heart attack than men with the lowest levels.


However, a study by the Harvard School of Public Health in Cambridge, Massachusetts disputes the findings.
The Harvard scientists compared two groups of about five-hundred American men. All the men in one group had
suffered a heart attack. The other men showed no evidence of heart disease. The Harvard scientists also examined
toenail particles for mercury. They found no link between mercury and the risk of heart disease.


Many doctors say people should not stop eating fish because of concerns about mercury.


This VOA Special English Health Report was written by George Grow.



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n.汞,水银,水银柱
  • The liquid we can see in thermometers is mercury.我们看到的温度计里的液体是水银。
  • Mercury has a much greater density than water.水银的密度比水大得多。
n.胎,胎儿
  • In the fetus,blood cells are formed in different sites at different ages.胎儿的血细胞在不同时期生成在不同的部位。
  • No one knows why a fetus is not automatically rejected by the mother's immune system. 没有人知道为什么母亲的免疫系统不会自动排斥胎儿。
adj.怀孕的,怀胎的
  • She is a pregnant woman.她是一名孕妇。
  • She is pregnant with her first child.她怀了第一胎。
学英语单词
absorption reaction rate
abuse of law
acrobatic show
Aleksandrinka
Allo-PBSCT
application workspace
arbitrally
blinking method of stereoscopic viewing
brass watch case blank
Chilean tinamous
cixiid
clap-hand
common laburnum
compartment hot well
compartmentalised
conductivity
contra-cyclical measures
Coquimbo owl
cross platform
cyclotheric sedimentation
dc data set
determinable freeholds
diacetylurea
dicumarols
elasto-aerodynamics
erosional vacuity
erotematic
final thermomechanicaltreatment
Gamu
general most favoured nation clause
glory of the snow
green goodss
gyroso-
hally
haylee
hofners
hydrated stock
hyperthite
idiologism
in the jug
incidental cost
ioduretted
items sample
keep on trucking
kindjals
koevoets
laminated clay
Lasianthus formosensis
leveling off
macro-observation
magmatic circulation
marine windscreen
mGal, mgal
moisture measurer for sand and stone
muscle scars
N.C.
nbcc
nobeliums
nuclenoic
NuLab
on-state characteristic
peritoneal tap
phthioic acid
plate mangle
prends
prevention of collision
prolmon tablet
pyramidal cells
raw mast
reactor coolant system cold leg isolation valve
Regranex
relative-entropy
reliability index of generating system
risto
Rubus chiliadenus
sit down to
solti
standard reference materials
starch ester
static stability margin
stochastic procss
strict secrecy
stupiditarian
superior characters
switching pulse
symbiotic action
synedra undulata
synthetic nitrogenous fertilizer
systematic production of substitution lines
thuggish
total corneal transplantation
total variation decreasing scheme
Tuamarina
twin-screw conveyor
TWTA
ultraviolet radiations
unintentional nonlinearity
unquietous
wassily chair
wax string
y.m