Echosounding
音响测深法
🗣️ 情景例句
His house was always neat.
他家经常都是干净的。
An ass endures his burden but not more than his burden.
驴子能负重，但不堪超过力之所及。
Spiders are busy for at least half the year in killing insects.
蜘蛛至少有半年在忙于吃昆虫。