大型的器材需要牢固固定于地下，并且要用水泥围住高于地面，如足球门桩、篮球架桩、秋千等。

Large facilities, such as football goal, basketball stand and swings, have to be fixed in earth fast and surrounded by concrete above the ground.

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机尾用钉子牢牢固定在模型飞机上。

The tail is fixed on the model plane with nails.

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然而，钢架的柱子是可以随着摇晃自由上下摆动，有钢管托牢牢固定在基座上。

The frame's columns, however, are free to rock up and down within steel shoes secured at the base.

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