1. Plants won't propagate in these conditions. 植物在这种条件下不能繁殖。
2. The easiest way to propagate a vine is to take hardwood cuttings. 繁殖葡萄藤最容易的办法就是采取硬木扦插。
3. Many of the species native to California, such as the prickly chaparral, rely on fires to propagate. 加利福尼亚有许多土生土长的物种,比如多刺的灌木荆棘丛,依靠火来繁殖。
4. Furthermore, the squalid, cramped quarters that encourage diseases to propagate among many animal populations are actually the residental choice for insects. 此外,肮脏、拥挤的住所促进疾病在许多动物种群中扩散,这实际上是昆虫对居住地方的选择。