What I care about is the

我要关注的是
mechanical properties of the tissue that I create;

我制造出的组织的机械性能
at least I care about that a lot.

至少我主要关注这方面性能
A bone that cannot form--perform the mechanical functions of bone

一块不能表现出骨骼机械性能的骨头
is not a very good bone.

就不是一块好骨头
It has to have the right elastic modulus,

这种材料要有合适的弹性系数
which we talked about earlier.

我们之前讲过
In other tissues you're trying

在其它组织中
to replace metabolism or the cellular biochemistry

你尝试使用的材料要能取代
that goes on inside the cells.

细胞的新陈代谢或其他生化功能
In the liver,

在肝脏当中
you don't care so much

你不用十分关心