1.be referred to as 被稱為
Our economy is referred to as a free market.
我們的經濟被稱作自由市場經濟 。
2.reactive 活性的
highly reactive substances
很容易起反應的物質
3.in practice 實際上
This is certainly a theoretical risk but in practice there is seldom a problem
從理論上講,這肯定是有風險的,可是實際上很少出問題 。
4.residue 剩余
Always using the same shampoo means that a residue can build up on the hair.
總是用同一種洗發水就意味著某種殘留物會在頭發上越積越多 。