It can be effectively separate the noise and vibration as its have some space at the end of the tube, the pipeline is not affected when thermal expansion or contraction.

因管末端有间隙可有效地隔断噪音及振动地传播，热胀冷缩时管路亦不受影响；

youdao

After a slight contraction at the end of 2008, the economy has been growing modestly this year.

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Also, the German Bundesbank said Monday the German economy has seen significant contraction heading into the end of the year.

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Stern has floated contraction as a possible means to that end.

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