-d concentration fields 三维浓度场
threshold d concentration 极限浓度
background d concentration 背景浓度
3-d concentration fields 三维浓度场
d stress concentration 三维应力集中
-d stress concentration 三维应力集中
3-d stress concentration 三维应力集中
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。
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。
The elastic recoil detection(ERD) method was used to measure the concentration of D and T in Ti film.
研究采用弹性反冲探测（ERD）方法测量钛膜中氘、氚的浓度。
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