Underprint
印在邮票图案下面的浅色底纹
🗣️ 情景例句
and left ... push ... push ... turn ... hit the floor.
向左……推……推……转身……坐地板。
It's an air-conditioner.
这是空调。
he identifies himself with its centre of gravity, its mass, its weight;
他把自身和物体重心、质量、重量融为一体。