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1.be referred to as 被称为
Our economy is referred to as a free market.
我们的经济被称作自由市场经济。
2.reactive 活性的
highly reactive substances
很容易起反应的物质
3.in practice 实际上
This is certainly a theoretical risk but in practice there is seldom a problem
从理论上讲，这肯定是有风险的，可是实际上很少出问题。
4.residue 剩余
Always using the same shampoo means that a residue can build up on the hair.
总是用同一种洗发水就意味着某种残留物会在头发上越积越多。
