n. one of the strands twisted together to make yarn or rope or thread; often used in combination
n. (usually in combinations) one of several layers of cloth or paper or wood as in plywood
v. apply oneself diligently
v. travel a route regularly
n. 厚度, 板层
vt. 使用, 使劲挥舞, 从事, 折, 弯
vi. 辛勤工作, 定期航行