An urgent problem to being solved is how to find out a proper operating mode in order to fasten transporting speed in one hand, meanwhile , and cut down operating cost in the other hand.
如何选择适当的业务操作模式，既加快港口业务运作，又节约业务运作成本，是国际物流企业面临的一个亟待解决的问题。
During a gravity drop, you let gravity pull the arm down, but at the end of the key drop, you need to tense the finger for an instant in order to stop the hand.
手臂自由下落时让重力把手臂往下带，但是当琴键压到底部时，你需要使手指片刻拉紧来停止手的下落。
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