Using Dr. Williams's method, astronaut George completed the first seed-to-seed experiment in space, and moved one plant closer to a garden in space.

利用威廉姆斯博士的方法，宇航员乔治完成了首个小株采种太空实验，并将一株植物移植到太空花园中。

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Dr Kuhn and Dr Stiner suggest that division of Labour actually originated in a warmer part of the world-africa seems most likely-where plant foods could be gathered profitably all year round.

库恩博士和斯蒂娜博士认为分工实际上起源于一片更温暖的土地——最可能是非洲。在那里全年都能采摘到植物食物。

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It was his technology and plant that we visited with Dr. Liu in Shanghai.

我们和刘博士在上海访问的正是他的技术和工厂。

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Dr. Plant said that proper technique and training are critical to reducing risk of injury.

WSJ: Soccer 'Header' Impact Likened to Hard Punch

The size of the ball matters, too, with greater forces exerted by larger balls, said Dr. Plant.

WSJ: Soccer 'Header' Impact Likened to Hard Punch

And players should make sure the ball doesn't absorb water, since that makes it heavier, according to Dr. Plant.

WSJ: Soccer 'Header' Impact Likened to Hard Punch