Human societies, though, are more complex than mere dyads.

然而人类系远比<span class="key">两两之间更为复杂。

The tricky part is — every dyad, every couple, every group especially, is different.

棘手的部分是——个二人组、对夫妇， 尤其是个群体， 都是不同的。

Automated towers use light emitting dyads or LED lights to help grow fresh animal feed.

自动饲养塔借助发光二极管或LED灯促使作为动物饲料的植物生长。