时间:2019-02-23 作者:英语课 分类:英语时差8,16


英语课

Remember seesaws 2? Those things were great. But there was often a problem. Suppose there’s a big kid on one side and a smaller kid on the other side. The seesaw 1 just stays in one position: big kid on the ground, smaller kid up in the air. No fun. After a few different tries, you probably realized that moving the big kid in toward the center made it possible to rock a little. Move the big kid even more and you can achieve balance. Now the seesaw works. What’s going on here? The answer is in the “center of mass.” The center of mass is a point somewhere along the plank 3 that holds the two kids where their average weight falls. If you can get the center of mass to be over the pivot 4 point, the seesaw will be balanced.



n.跷跷板
  • Prices have gone up and down like a seesaw this year.今年的价格像跷跷板一样时涨时跌。
  • The children are playing at seesaw.孩子们在玩跷跷板。
n.跷跷板,上下动( seesaw的名词复数 )v.使上下(来回)摇动( seesaw的第三人称单数 );玩跷跷板,上下(来回)摇动
n.板条,木板,政策要点,政纲条目
  • The plank was set against the wall.木板靠着墙壁。
  • They intend to win the next election on the plank of developing trade.他们想以发展贸易的纲领来赢得下次选举。
v.在枢轴上转动;装枢轴,枢轴;adj.枢轴的
  • She is the central pivot of creation and represents the feminine aspect in all things.她是创造的中心枢轴,表现出万物的女性面貌。
  • If a spring is present,the hand wheel will pivot on the spring.如果有弹簧,手轮的枢轴会装在弹簧上。
学英语单词
-odon
adbots
alexeteric
anabantoids
Antonio Vivaldi
arc furnace installation operating unbalance
Arnsdorf
arteriograms
as she is standing
automatic component assembly
bare and line chart
basketball backboards
battery separator
bedcovers
Bella Coola
benstead
bioanalyze
blabbermouth
bronwen
buffered memory
by-pass cancel character
Calpurnius
Cartesian doubts
centroamericanos
chirodrill
Cirta
coil stripping
complement inhibition test
cooperative decision
corant
coriander plant
coronal invagination
crony-capitalist
cross-flow heat exchanger
Crotalaria tetragona
datalogics
date from
decani
Derecske
diazetine
dipping smuff
disjunctive complement
divorce concilliation
double coating
education-industries
electronic manipulative deception
enamel insulated aluminium wire
Fasciolites
finish casing
foorman
Gilberton
gynecological physiology
household finance
I2KI
idiophonia
in one's heart of hearts
ISBD
kindleth
lead tolerance
licurim
linaloa
lupus serpiginosus
make a raise of
mammea americanas
Mingin Ra.
nestor notabiliss
of cardiac valves incompetence
opisthorchiasis
Owens
palmeirim
Pan American
penalty factor for rod bow
perseverate
petty bourgeois
phosphatic sediment
pightel
Pocket PC
podilfen
protected trade
rate-of-change map
resilient joint material
sample power
scolopsis bilineata
spectroscopic eigenvalue analysis
Spironucleus
strengite
subessive
sulphenamide
supplyable
synchronizing angle
theory of immunity
Trojan planets
troutlet
turning range mark
u-ni-ty
UNEF-thread
vacuum feed tank
vertical riser cable
weigh ... out
zamia pumilas
Zav'yalovskiy Rayon
zeljko