The color green is natural for trees and grass. But it is an unnatural color for humans. A person who has a sick feeling stomach may say she feels a little green. A passenger on a boat who is feeling very sick from high waves may look very green.绿色是草木的自然颜色,但人可不是这样.胃不舒服的人可能会说她觉得有点难受(feels a little green).船上的乘客由于波浪大而晕船看上去也会脸色发青(look very green).
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