Three times a year Prof Thomson compared the fruiting rate of flowers that were left to be pollinated naturally, or given extra doses of pollen by hand.
汤姆森教授每年三次比较有待自然授粉或需人工授粉花的结实率。
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There pollution is so bad that most if not all Bee's and other pollination insects have vanished a majority of their grown food is pollinated by hand...