Some species of Arctic birds are threatened by recent sharp increases in the
population of snow geese, which breed in the Arctic and are displacing birds
of less vigorous species. Although snow geese are a popular quarry for hunters
in the southern regions where they winter, the hunting season ends if and when
hunting has reduced the population by five percent, according to official
estimates. Clearly, dropping this restriction would allow the other species
to recover.
這句話:the hunting season ends if and when
hunting has reduced the population by five percent
為什麼可翻成當至少獵到５%數量,打獵季節結束?
reduce這邊怎麼翻呢?
謝謝!
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