来由的英文：
cause; reason

参考例句：

But the mindless tenderness that he had felt under the hazel tree, while the thrush was singing, had not quite come back
方才在榛树下面，听那鸫鸟歌唱，他心里也充满了柔情;然而那情感好没来由，跟现在不太一样。

the pedigree of a document
文件的来由和发展

The children were left in the charge of a nurse.
孩子们留下来由保姆照管。

cause是什么意思：
n. 原因；理由；事业，目标
v. 引起；使遭受；促使

There is no cause for concern.
不必担心。

To cause to zoom.
使急遽上升，使猛增

To cause to taper.
使成锥形

To cause to patter.
使发出嗒嗒声

To cause to disintegrate.
使瓦解；使蜕变

reason是什么意思：
n. 理由，原因，理性，理智
v. 劝说，规劝，辩论

The authority is not reasonable.
这个判例并不合理。

Reasonably adv.
适度地。

This is a potent reason.
这是一个令人信服的理由。

Is this a reasonable postulate?
这是不是一个合理的假设？

A reason to start over new, and the reason is you.
一个让自己重新开始的理由，而这个理由就是你。