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The needle on a pressure gauge twitches ever further into the red.
压力表上的指针甚至摆动到了红线外面。
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Note: it is important that the differential gauge needle drops slowly.
注意：重要的是，差压计的指针要慢慢下降。
youdao
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Note: it is important that the differential gauge needle drops slowly.
注意：重要的是，差压计的指针要慢慢下降。
youdao