push against的用法和樣例：
例句
- He felt something hard, like a gun, pushing against his back.
他感到有什么硬東西，像是一把槍，頂在他的背上。 - An airplane cannot fly out into space be cause it must have the air for its propellers to push against.
飛機不能飛入太空，因為飛機的螺旋槳如果沒有空氣的反推力推進，是飛不起來的。
詞匯搭配
- push up against 向 ... 用力推...
