1. An avalanche is a sudden and rapid flow of snow often mixed with air and water down a mountainside. 一场雪崩是从山腰上塌落的一次突然和迅速的常常混合了空气和水的雪流。
2. Explants are also a means of plant propagation, producing clones and offering a more rapid means of multiplication than seed production. 组织培养也是一种植物繁殖方式，它产生克隆，提供一种比种子发芽更为快速的增殖方法。
3. So far, the fastest and best way to be using floating vegetation pyrolysis oxygen carbonization process, the rapid carbonization of crop straw. 目前为止，最快最好地方法，应该是利用草木高温分解浮氧碳化工艺，快速炭化农作物秸秆。
英英解释
n.
1. a part of a river where the current is very fast
2. done or occurring in a brief period of time
3. characterized by speed; moving with or capable of moving with high speed
