当我正在拍摄它们的时候,领头的海狮直立起来,四周看了看,然后直朝着海滩方向快速游去了,整群海狮也跟过去了。
While I was photographing them, the leader of the group stood straight up and looked around and then swam straight and fast for the beach with the entire group following.
板的下半截要双的,上半截要整的,直顶到第一个环子;两块都要这样做两个拐角。
At these two corners they must be double from the bottom all the way to the top, and fitted into a single ring; both shall be like that.
PID参数整定与优化一直是自动控制领域研究的重要问题。
PID parameter tuning and optimizing is an important issue in the field of automatic control.
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