Support on chocks, as of boats, for example.
用楔子支撑，比如在船上。
An almost extinct species of extra wide pitons. Now, large chocks are usually used instead.
一种几乎绝迹的宽岩钉，现已经被大形岩楔取代。
Chocks inserted, landing gear safety pins inserted, ground power unit on, release brakes, Please.
轮挡已挡好，起落架安全销已插好，地面电源接好，请松刹车。
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