(1)铅(soft，heavy，grayish metal)[U]：We must remove～from petrol because it is poisonous. 我们必须去除汽油中的铅，因为它有毒。as heavy as～很重;～pipes 铅管;

(2)铅笔芯(dark gray substance inside a pencil)[U，C]：The～of my pencil is broken. 我的铅笔芯断了。L～pencils contain black～.铅笔里面有黑色的铅芯。

(3)(航海)测深锤(weight attached to a line and tossed over the side of the ship for measuring the depth)[C]：cast the～用测深锤测深;

→′leaden adj 铅色的;沉重(闷)的;′leaded adj 加铅的;用铅条为框架的;′leadless adj 无铅的;′lead-′poisoning n 铅中毒