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Do not stand a ladder on loose material or lean it against fragile material.
不要将梯子安放在松软或靠在易塌的物件上。
youdao
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Sit up straight on your chair; do not lean heavily against the back.
坐在椅子上时应坐直，不要紧靠在椅背上。
youdao
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Sit up straight on your chair; do not lean heavily against the back.
坐在椅子上时应坐直，不要紧靠在椅背上。
youdao