When astronauts go on spacewalks, they wear spacesuits tokeepthemselves safe.
当宇航员在太空行走时,会穿太空服以保证自己的安全。
2
At the esoteric edge of the timekeeper's craft, they are too wobbly tokeep time by themselves.
在这个原子钟的装置里,它们还是太不稳定了,不能靠自身确保时间。
3
Some use them tokeep a close watch on the demand for their line of work or gather information on compensation to arm themselves when negotiating for a raise.