Instead of pinching off and saying goodbye, plant cells are forever locked in next to their parent cells.

植物细胞永远被锁在它们的亲本细胞旁边，而不是被掐掉、就此离去。

As the patch of air above collects moisture and heat cooler, heavier air sinks around it, pinching it off and pushing it aloft, like an invisible hot-air balloon.

上方的空气有了湿度和热能，较冷、较重的空气会向下包夹它，并把它向上推，如同隐形的热气球。