在坐着或走路时脖子保持直立
Try to maintain an upright posture while sitting or walking.
滑进一张椅子中,或者保持直立,来回的摇晃。
Slip into a chair or remain upright, and sway back and forth.
当鱼鳔膨胀时,会增加天然浮力助,帮助鱼类在水中保持直立姿势。
When inflated, the bladder serves as a natural buoyancy aid, keeping the fish upright in the water.
And make sure that it was a little stand all right.
一定要确保圣诞树保持直立。
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