Wave upon wave of negative economic reports keep pushing the world markets down.
一波又一波的经济坏消息接踵而来，促使全球股市大幅走低。
The negative pressure wave method was proposed for a pipeline leak detection system.
采用负压波法检测管线泄漏信号。
The negative pressure wave method was proposed for a pipeline leak detection system.
采用负压波法检测管线泄漏信号。
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