During the rest of the class, he leaned back in his chair, stretching out his long legs.

在整堂课的其余时间里，他向后靠在椅子上，把两条长腿伸到前面。

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Here, rest your head against the back of the chair.

来，把你的头靠在椅背上。

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The chair seat is provided with a water-leaking hole penetrating the chair back-rest.

所述椅座上设有穿透椅座的漏水洞。

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The chair will help keep the rest of the back and neck erect and decrease your chance of hunching forward, which can cause spasms in the back and neck and headaches.

FORBES: Magazine Article

The chair will help keep the rest of your back and neck erect in order to decrease your chance of hunching forward, which can cause spasms in the back and neck and lead to headaches.

FORBES: The 10 Best Exercises To Do At Your Desk