set off和set out都有“出发”的意思，当作这个意思的时候有什么区别吗？

set off和set out都有“出发”的意思，当作这个意思的时候有什么区别吗？

set off和set out 这两个词组
作为出发的意思时,用法是一样的,没有多少区别,
具体用法是用set off for someplace, set out for someplace,可以互相替换.
例句:
一, set off for someplace
1,I set off for the valley, trusting to luck .
我动身去山谷了，一切全凭运气。
2,We set off for London just after ten.
刚过十点，我们就动身上伦敦去了。
二,set out for someplace
1,We set out for home.
我们就动身回家了。
2,He set out for Nanjing on a warm spring morning.
在一个暖和的春日早晨，他往南京去了。

set off1.a. To give rise to; cause to occur: set off a chemical reaction.b. To cause to explode: set off a bomb.c. To make suddenly or demonstrably angry: The clerk's indifference finally set me off.2. To indicate as being different; distinguish: features setting him off from the crowd.3. To direct attention to by contrast; accentuate: set off a passage with italics.4. To counterbalance, counteract, or compensate for: Our dismay at her leaving was set off by our knowing that she was happy.5. To start on a journey: set off for Europe.
set out1. To begin an earnest attempt; undertake: He set out to understand why the plan had failed.2. To lay out systematically or graphically: set out a terrace.3. To display for exhibition or sale.4. To plant: set out seedlings.5. To start a journey: She set out at dawn for town.

set out和set off都有出发的意思
set off更含开始(旅行、赛跑等）的意思，
例：what time are you planning to set off tommorrow?你明天打算几点钟启程？set out意思是从某地出发上路
例：she set out at dawn.她天一亮就动身了。

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