Servomagnet
伺服电磁铁
🗣️ 情景例句
I'm having some trouble keeping food down.
我吃东西时感到困难。
A single spark can start a prairie fire.
星星之火，可以燎原。
he realizes its volume, as the space that the shape displaces in the air.
他能意识到物体的体积，那就是它的形状在空气中所占的空间。