shrug
vi. lift (the shoulders) slightly (to show in difference, doubt, etc.) 耸肩
finally
ad. at last; lastly 最终;最后
present
vt. give;offer 赠送;提供
tube
n. 管;软管
beam
vi. look or smile happily and cheerfully 面露喜色;高兴地微笑
beard
n. hair of the lower part of the face (excluding the moustache) 胡须
thereafter
ad. after that; afterwards
revert
vi return (to a former state, condition, etc.) 回复,回返
exclusively
ad. only; completely
exclusive
a. person who forms theories 理论家
theorist
n. 方程式
equation
n. small in degree, not considerable or serious 微小的,轻微的
application
n. using 应用
theory
n. (explanation of the) general principles of an art or science 理论
theoretical
a.
reactor
n. 反应堆
atomic
a. of or concerning an atom or atoms 原子的
atom
n.
photoelectric
a. 光电的
series
n. group of things of the same kind that come one after another 系列;套,组
relatively

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