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

然而人类社会关系<span class="key">之间更为复杂。

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

自养塔借助发光二极管或LED灯促使作为物植物生长。

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

棘手部分是——每个二人组、每对夫妇， 尤其是每个群体， 都是不同。