In plants,a long thread-like structure of cellulose,such as cotton,esparto, wood,etc.
在植物里,是一种长条状纤维素结构,例如棉、西

和木等。
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手记 A bulldozer is a powerful vehicle with a caterpillar track on it, so it means that the wheels act kind of in a long caterpillar-like tread, and those treads move in a long circular motion rather than just in a circular motion.
推土机是一种装有履带的强大车辆,这意味着其轮子作用类似于
形的履带
履带,这些履带进行的是
周期的圆周运动, 而非简单的圆周运动。