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

然而人类社会关系远比<span class="key">两两之间更为复杂。

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

自饲养塔借助发管或LED灯促使作为物饲料的植物长。

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

棘手的部分是——每个人组、每对夫妇， 尤其是每个群体， 都是不同的。