We have studied the level crossing effect in degenerate four-wave mixing and compared it with the level crossing effect in resonance fluorescence.
研究了简并四波混频的能级交叉效应，并与共振荧光的能级交叉效应比较。
When crossing uneven ground, a stretcher should be carried by four people and kept as level as possible.
当通过不平整的地面时，担架要有四人抬，并尽量保持水平。
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