The plane will be landing in half an hour and the washrooms will be closed soon. You'd better use it now if you need to.
还有半个小时飞机就要降落了，洗手间马上就要关闭了。如果你要去厕所最好现在就去。
The symmetric values about the imaginary axis of zero-poles which the unstable process lies in the open and closed right-half plane are defined as their mirror-injection.
非稳定过程在开右半平面的零极点关于虚轴的对称值称为该零极点的镜像映射。
The plane will be landing in half an hour and the washrooms will be closed soon.
还有半个小时飞机就要降落了，洗手间马上就要关闭了。
The plane will be landing in half an hour and the washrooms will be closed soon.
还有半个小时飞机就要降落了，洗手间马上就要关闭了。
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