物质: matter; substance; material 短语和例子可裂变物质 fissionable material; nuclear materials; 物质以三种形态存在: 固态、 液态和气态。 matter exists in three states: solid, liquid and gas.; 物质不灭定律 the law of conservation
产: Ⅰ动词1.(人或动物的幼体从母体中分离出来) give birth to; be delivered of; breed 短语和例子流产 miscarriage; abortion; 难产 a difficult delivery; 顺产 an easy delivery; 死产 still birth; 早产 premature birth; 助产 midwifery;
