Lab also laboratory n. a building or room which contains scientific
apparatus and in which a scientist works 实验室；实验大楼
labour/labor 1. work, esp. tiring physical work, or effort
（尤指费力的）体力劳动
2. workers, esp. those who use their hands 劳力；工人；
（尤指）用手操作的工人
3. the act of giving birth 分娩
lack v. to be without; not have enough of 缺少；缺乏；短缺
n. absence or need 缺少；缺乏
ladder n. a frame with steps, used for climbing, as up a building or the
side of a ship 梯子
