常见例句Genus of small evergreen tropical and subtropocal American cycads.一种小的常绿热带和亚热带美洲苏铁。Cycads and ginkgo have motile sperm, unlike gnetophytes and conifers, which produce pollen.苏铁和银杏具活动精子可区别于买麻藤和松柏类，它们不产生花粉。 返回 cycads