Translation of "taproot" into Chinese

But how does the small seedling survive this long dry run until its taproot hits water?

可是,在主根还未找到水源之前,幼苗又如何经得起长年累月的干旱呢?

But it is the deep-probing taproots that locate the underground reservoirs so efficiently that well diggers sink their wells nearby.

它深入地下探水的直根能够如此有效地探知地下水所在,以致挖井者可以放心就在树的附近挖井。