as grass is hard to find beneath the snow. 因为冰雪之下很难找到草
But just as some mammals evolved to feed on the grass, 但在一些哺乳动物 进化成以草为食的同时
strengthened to prevent silica in the grass from wearing them out... 能够防止草中的二氧化硅磨损牙齿
Thunk! Try hiding from it in the tall, dry grass! 桑克 躲到高大的干草从里
from a boy so green he pisses grass. 毛头小鬼,你的尿八成都是草绿色的
Grass and horses. People can't live on grass. 青草和马,人可不能吃草