Synchronized embryogenic cultures at different developmental stages were obtained by controlling 2,4-D concentration and developmental time.

通过对2，4-D浓度及生长发育时间的控制获得了高度同步化的各发育阶段体胚材料。

youdao

If I integrate the concentration of smoke, which means the amount of smoke per unit volume over d, I will get the total amount of smoke in d, except, well, let's see.

如果对烟雾的浓度积分，浓度就是区域d中，单位体积的烟雾的量，我们就得到了烟雾的总量。

youdao

The model could well predict the concentration of D-tryptophan in the permeated solution and separation factor.

此模型可以对渗透液中d -色氨酸的浓度和分离系数进行较准确的预测。

youdao

"There was a lower concentration of dopamine markers in the brain of individuals with A.D.H.D., specifically in the areas of the brain that are involved with reward and motivation."

VOA: special.2009.09.29

Mr. MCWHORTER: I'd like to see a little more concentration on our own community, and then we'll get to Africa.

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This noise consisted mainly of the high-pitched whirr of the CPU fan, but it was barely noticeable -- to the point where if you got distracted, you'd have to re-focus your concentration just to make out the sound.

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The third major change is the concentration of activity in Washington, D.

NPR: Intelligence Failures In 'Top Secret America'