导链的英文：
leading chain

leading是什么意思：
n. 领导，疏导，铅板 adj. 主要的，重要的

Will you take the lead?
你领个头好吗？

Lead poisoning( or plumbism )：Poisoning by accumulation of lead in the body.
铅中毒:铅在体内积累引起的中毒。

The road leads direct there.
这条路直接通那儿。

The dog is straining at its lead.
那条狗正使劲地拖拽皮带。

Put the dog on the lead!
用皮带牵住狗！

chain是什么意思：
n. 链，束缚，连锁
v. 用锁链拴住，束缚，囚禁

a chain of supermarkets/a supermarket chain
超级市场联号.

a chain of mountains/a mountain chain
连绵的山[山脉]

Chains of gold are stronger than chains of iron
金链锁人比铁炼更牢靠

chain, link, articulated, other than roler chain
滚链除外的铰接链

The length of the chain molecule is proportional to the kinetic chain length
链分子的长度与动力学链长成正比。