Backstep
后退
🗣️ 情景例句
I don't think anyone would disagree.
我想没人会反对。
He did not conclude that Anna had misunderstood.
他没法断定安娜是否存在误解。
So was born the echo-sounding apparatus, now in general use in ships.
这样就产生了目前各种船舶上普遍应用的回声探测仪。