用环剥树皮等方法可以诱导多倍体无性系提早开花。
Girdling and other treatments can induce polypoid plants to flower earlier.
雄性和雌性非洲象的象牙是用于掘食、掘水以及剥取树皮的。
Both male and female African elephants have tusks they use to dig for food and water and strip bark from trees.
雄性和雌性非洲象的象牙是用于掘食、掘水以及剥取树皮的。
Both male and female African elephants have tusks they use to dig for food and water and strip bark from trees.
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