They say that travel broadens the mind.他们说旅行能够开阔心胸。It broadens perspective, proves or disproves hypotheses, and substitutes facts in place of opinions.它开拓你的眼界, 证实或不证实假设, 用事实替代了观点.Soon the Yangtze opens out and broadens.不...
Homogamy occurs in the closed cleistogamous flowers that appear late in the season in certain plants.导致发生自花授粉的可能性很大.Cleistogamous plants produce flowers which either open only partly or not at all.闭花受精植物产生的花只是部分地开放或完全不开放...