A newer anti-HIV drug called pyridinone caused HIV to mutate into a form which could not reproduce or infect new cells. 一种叫作吡啶酮的新型抗艾滋病药物能促使艾滋病毒变异，使其不能繁殖，也不会再感染新的细胞。
It's inconstancy, but not inability, that's to be feared.不怕无能, 就怕无恒.Hermia was looking at him and wondering at his strange inconstancy.赫米亚望着他,对他莫名其妙的反复无常感到很惊奇.It must be a confession of his inconstancy and conf...
“你知道，我交朋友有一套的，”她故意补充说。"I have a knack for making friends, you know," she added meaningfully.他是个爱交朋友的人。He is a clubbable chap.她交朋友往往热情而超俗。She tends to have intense, spiritualized friendships....
Volunteers constitute more than 95% of The Center's work force.该中心95%以上的工作人员是志愿者.The work force has been laid off.工人们被辞退了.In the last ten years automation has reduced the work force here by half.在过去的10年中，自动化已经减少了这里一...