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When it comes to contraception, men may finally have a greater choice than a condom or vasectomy.

In a new study, researchers who want to develop on-demand male contraceptives say they’ve figured out a way to prevent pregnancy: temporarily stop the sperm from swimming.

With what some have described as a “global epidemic” of unplanned pregnancies, it seems to be fertile ground.

生词短语：

contraception 避孕(法)

vasectomy 输精管切除术

on-demand 随需应变；按需

contraceptive 避孕药; 避孕用具; 避孕措施

unplanned pregnancy 意外怀孕

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