Pertest
percolation test(ing) 渗透试验
🗣️ 情景例句
Thank you--
谢谢你。
A ready way to lose friend is to lend him money.
失友都因借钱起。
He gets out of the lift. Then he walks to a bus stop.
他走出电梯。然后步行到公共汽车站。