在行的英文：
be on it
in one's element
know one's business
know one's onions
know one's stuff
know one's way about
know what's what
on one's own ground
on the ball

参考例句：
  • The regiment is on the march
    该团在行军中。
  • Soldiers must keep step with each other in marching
    士兵们在行军中应相互看齐，步调一致。
  • Typing just is not my line.
    我对打字毫不在行。
  • I'm pretty good at water skiing.
    滑水橇我很在行。
  • I don't know that I am apt at tending fowls.
    恐怕我养鸡不在行。
  • I 'd say I am quite proficient at tailoring.
    我可以说我对裁缝很在行。
  • They slaughtered quickly and efficiently.
    他们杀得又迅速又在行。
  • Foreigners are more at home with knives and forks
    外国人使用刀叉更在行。
  • From what I've heard you're ready well up in shipping work.
    据我所知,您对运输工作很在行
  • The small car wove through the traffic.
    小汽车在行人和车辆中迂回前进。
one是什么意思：
num. 一；同一个、最重要的一个
det. 代替a或an，表示强调；某位（用于不太熟悉之人的姓名之前）
pron. 任何人；一个人；一个事物；其中的一个人
  • One, Taipei, one way.
    台北单程票一张。
  • This one is not a spoof.
    这个就不是开玩笑了。
  • One and one make(s) two.
    一加一等于二。
element是什么意思：
n. 要素；元素；基本原则；零件
  • enhancer element
    增强子元件
  • There are some non-elemental monsters that have no elemental attributes.
    有一些没有元素属性的怪物。
  • Can you control elements?
    您能操控元素吗？
know是什么意思：
v. 知道，了解，懂得；认识，熟悉；认出；体验；见到过，听到过
  • Learn not and know not
    不学无术
  • Know/not know what is most important and act accordingly
    能[不能]按轻重缓急行事
  • Do you know that lady?
    你认识那位夫人吗？

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