重点讲解：
1. be responsible for 负有责任的；应承担责任的；
ART technologies are now responsible for more than one percent of births in the U. S. and most Western countries.
目前在美国和大多数西方国家通过辅助生育技术出生的婴儿约占百分之一还多wq=jA=H&_;FkUvYTFpPd。
2. because of 因为；由于；
We have had to raise our prices because of rising costs.
因为成本日益上涨，我们不得不提高价格(@%.[aeU~b787。
3. focus on 集中(注意力)；关注；
They focus on overt discrimination rather than insidious aspects of racism.
他们关注的是公开的歧视，而不是种族主义的一些潜在问题H2*t-%)eFk_f~。
4. in turn 继而；转而；反过来；
That, in turn would increase pressure for higher wages and that, in turn, would impact on inflation and competition.
那样就会增加工资上涨的压力，而那样又会对通货膨胀和竞争产生影响%+ITWtSND*nk。

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