Your doctor will perform several tests to help figure out the problem. Your partner also should have tests because he could have a fertility problem.

医生会做一些检查以帮助指出问题。因为你的伴侣可能有生育问题，也应该做些检查。

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But the rock-bottom fertility rates in the tigers give the problem particular potency.

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Panos Zavos , the Kentucky fertility doctor and would-be human cloner, apparently doesn't see Lucas' clone army as a problem.

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Falling fertility has taken much of the urgency out of the debate about population growth, at least among experts, since it seems to be solving the problem of excessive births (a view criticised by Mr May, who points out that even if fertility has declined, the momentum of change means populations will go on rising for a while).

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