时间:2019-01-22 作者:英语课 分类:英语时差8,16


英语课
Humans have used many devices 2 to measure time. The sundial was one of the earliest and simplest. A sundial measures the movement of the sun across the sky each day. It has a stick or other object that rises above a flat surface. The stick, blocking sunlight, creates a shadow. As the sun moves, so does the shadow of the stick across the flat surface. Marks on the surface show the passing of hours, and perhaps, minutes. The sundial works 3 well only when the sun is shining. So, other ways were invented to measure the passing of time. One device 1 is the hourglass.The hourglass is shaped like the number eight --- wide at the top and bottom, but very thin in the middle. In a true "hour" glass, it takes exactly one hour for all the sand to drop from the top to the bottom through a very small opening in the middle. When the hourglass is turned with the upside down, it begins to mark the passing of another hour. By the eighteenth century, people had developed mechanical 4 clocks and watches. And today, many of our clocks and watches are electronic.
 

n.器械,装置;计划,策略,诡计
  • The device will be in production by the end of the year.该装置将于年底投入生产。
  • The device will save much time and effort for us.这种装置会使我们节省大量时间和气力。
n.设备;装置( device的名词复数 );花招;(为实现某种目的的)计划;手段
  • electrical labour-saving devices around the home 节省劳力的各种家用电器
  • modern labour-saving devices such as washing machines and dishwashers 诸如洗衣机和洗碗机之类的现代化省力设备
n.作品,著作;工厂,活动部件,机件
  • We expect writers to produce more and better works.我们期望作家们写出更多更好的作品。
  • The novel is regarded as one of the classic works.这篇小说被公认为是最优秀的作品之一。
adj.机械(学)的;力学的;机械似的;手工操作的
  • He borrowed a mechanical book from me.他从我这儿借了一本力学方面的书。
  • He looks very mechanical.他看上去非常呆板。
学英语单词
active trimming
activity restart cycle
Advertisement Regulation Act
Andaman Islands, Andamans
average-weight
beamtherapy
binomial distribution probability
Boselaphus
break release
break-even price
Bretton Woods Monetary Agreement
Briterlich variable radius technique
Changsando
channel address half word table
choga
cigar wrapping
Cinnopropazone
cluster spring
coal storage yard
contractual forum
coriandrol
Cremanthodium angustifolium
cross software
crownhills
crucilly
diagnoser
docuhistory
Donghai
double venturi tube
driving motion
ease someone out
epigenetic mineral
every two years
fate of particles
functional density
GDP dissociation inhibitor
general inquiry
General of the Army
grays in silicon
h. h. munroes
Hanke-Koessler's tests
heldover
heteromorphous combination
hormonagoga
HTML
image-motion compensator
instantaneous error of rotation
Itapicuru
kemmons
kertzmen
kroeng
lanagan
lasta
letter stock
Lord High Chancellor
lubricating oil starting pump
mark of the beast
Mitreola
morphoanatomically
negative viscosity
noninterlocked area
only the good die young
options tariff
oral bundle
parenchyma strand
pecornut
Pedicularis siphonantha
pennorth, pennorth
phosphor laser
placodes
plant colo(u)ring matters
plug-ins
Pyrularia sinensis
reacton turbine
receiving-departure yard
reindustrialising
remote readout
rosies
rotary cultivator
s phenomenon Bordet
schmoozer
scumbered
sideelevation
sight feed siphon lubricator
single-chip
solar satellite
solvd
spot trading
Strait of Hormuz
superior phrenic arteries
tensile
tubular resistance
tyre building
ultraphysical
under-the-counters
uniform divergence
uraeotyphlids
wood-hen
Working Tax Credit
X car
xylariopsis uenoi