So that you can readily understand and master the goods in transit location and status.

让您能随时了解和掌握货物在运送途中的位置和状态。

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Understand and master the sort of passenger train and number, to us journey bussiness trip is very helpful.

了解和把握旅客列车的种类和车次，对我们出差旅行是很有帮助的。

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Of knowledge and materials in these areas should be done before the respondent had better understand and master.

这些方面的知识和材料都要在答辩前做到有比较好的了解和掌握。

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Stops of light at first seems confusing and not as important to those who don't understand exposure, but if you ever plan to become a master at photography, learning the terminology is key.

ENGADGET: Primed: What is aperture, and how does it affect my photos?