1·Rain washes away loose soil and penetrates cracks in the rocks.
雨水冲走了松散的土壤，穿透了岩石的裂缝。
2·Unrelenting darkness is another barrier to exploring the deep. Sunlight penetrates seawater to a depth of only a few hundred feet.
无尽的黑暗则是妨碍深海探索的另一大障碍，因为阳光只能穿透几百米深的海水。
3·Then the cold penetrates the double layer of gloves and sets to work on chilling my fingers.
然后寒冷穿透双层手套开始来冻僵我的手指。
4·When a person drinks the water, the cyclop is killed by the acidity of the stomach and the larva is freed and penetrates the gut wall.
当人饮用这种水时，剑水蚤被胃酸杀死，幼虫则得以释放并穿透肠壁。
5·So, basically, in order to move, a cell climbs hand-over-hand along the extracellular matrix until it reaches a blood or lymphatic vessel and penetrates it. From there, it's smooth sailing.
基本而言，细胞顺着细胞外基质移动，一旦发现血管或淋巴管，穿透血管和淋巴管，这样就畅通无阻了。