前人的英文：
ancestors

People had no previous information to guide them.
人们尚无前人的资料可供借鉴。

One generation opens the road upon which another generation travels
前人开路后人行

A forerunner or predecessor.
前人，先驱先行者或先驱

Prehistoric man used flint knives.
史前人用打火石刀。

All we have to do is follow the trail of those who went before us.
我们所能做的只是步前人的后尘。

We dare to break a path unbeaten before
我们敢于走前人未尝走过的新路。

What we do today is something never dream of by our forefathers.
今天我们正做的是我们的前人做梦都未想过的。

What we want to do is to accomplish the great cause of reunification left unfinished by our forerunners.
我们是要完成前人没有完成的统一事业。

Each of them learned from their predecessors but formed their own distinctive qualities in their work.
每一书家在继承前人的同时，又融进了自己的个性。

His early paintings were sober and sensible, in the academic style.
他的早期画幅朴实明快，大都因袭前人的笔调。

The abacus is the ancestor of the modern computer.
算盘是现代电脑的原型。

"ancestral: Of, relating to, or evolved from an ancestor or ancestors."
祖先的:与祖先有关的,祖宗传下的。

The sins of the ancestors were visited on their descendants.
祖先的罪恶报应到他们后代的身上

The villagers still follow the customs of their ancestors.
村民们仍然遵从他们祖先的习俗。

My ancestors came from Italian.
我的祖先是意大利人。