Grooving: Metal chips or other foreign material in the system lead to axial cuts on the dynamic side of the seal. Expanded air bubbles (cavitation) can cause also this phenomenon.

沟槽：在系统中的金属屑或外部的材料在密封的运动面轴向切断，空气气泡的膨胀(气蚀)也能引起这个现象。

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Because great numbers of people go there, the islanders have built elaborate resorts, developed harbors and airfields, improved the beaches and have expanded sea and air routes.

由于很多人去那里，岛民们建造了精心设计的度假村，开发了港口和机场，改善了海滩，并扩展了海路和空路航线。

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You probably noticed that your shoulders raised, your chest cavity expanded and you felt the air in the upper part of your stomach. If you didn't, try it again.

你会发现，你的肩升高了，你的胸腔舒展开了，你感觉空气进入你的胃中；如果没有，那就再来一次。

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Later in 1970, the government passed an expanded Clean Air Act and created the Environmental Protection Agency.

CNN: STORY HIGHLIGHTS

Our air forces have expanded their interaction to include multinational air exercises hosted by each country, such as the U.S. RED FLAG and Brazilian CRUZEX exercises.

WHITEHOUSE: Fact Sheet: U.S.-Brazil Defense Cooperation

"If this expanded version was launched, Air France-KLM could order a significant amount, " Spinetta was quoted as saying by the French business daily La Tribune.

FORBES: LONDON