坐凳子或椅子时，凳子或椅子的四只脚要完全着地。

When sitting on stools or chairs, all four feet of stool or chairs must be on the floor.

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在花园里干活时如果背疼，应考虑坐凳子而不要站着弯腰。

That means if your back tends to bother you, consider sitting on a bench while gardening rather than bending over while standing up.

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第一个说：“谁坐过我的凳子？”

The first said, "Who has been sitting on my stool?"

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