Effecive lever arm
[機] 有效桿臂
?? 詞語組成解析
lever
['li:v?, 'lev?]
n. 杠桿;操作桿;工具;
vt. 用杠桿撬動;
arm
[ɑrm]
n. 臂;武器;[復數(shù)]戰(zhàn)事;權力;
vi. 準備（斗爭），準備行動（against）;
vt. 裝備（防御工事）;準備（攻擊或迎擊）;配備;防護;
??? 情景例句
Don't jump the gun.
別輕舉妄動。
Procrastination is the thief of time.
拖延即浪費時間。
'You'll have to get off here,' the conductor said.
“您得在這里下車，”售票員說，