In common physics optical experiment, single lens is used often as to wait for measuring lens in measuring of focal length.
在普通物理光学实验中，焦距的测量通常使用单透镜作为待测透镜。
The tightening of the bands is often used by traders as an early indication that overall volatility may be about to increase and that a trader may want to wait for a sharp price move.
紧凑的布林线被交易员认为是整体波动增加将会出现价格剧烈变动的早期信号。
The tightening of the bands is often used by traders as an early indication that overall volatility may be about to increase and that a trader may want to wait for a sharp price move.
紧凑的布林线被交易员认为是整体波动增加将会出现价格剧烈变动的早期信号。
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