发出：指以某种形式散发出来。
放出：指释放出某种物质或能量。
give off // [ giving gave given gives ]
动词词组 If something gives off or gives out a gas, heat, or a smell, it produces it and sends it out into the air. 散发出 (气体、热量或气味)
...natural gas, which gives off less carbon dioxide than coal.
…天然气的二氧化碳排放量少于煤。
... get off 下车，脱下（衣服）；（飞机）起飞 give off 发出(光等),放出,排出 go off 走开，熄灭； 动身去某地； 炸锅 ...
... 3．give in 投降，屈服，让步，交上(考卷等) 4．give off 放出，发出(光、热、气味等) 5．give out 分发，发出(气味，热等)，发表，耗尽，精疲力竭 ...
... give in投降;交上去;听任 give off发出或放出(蒸气等) give out分发;发出(气味等) ...
... give back 归还、送回 give off 散发出(气味、光等) give ot 分发，放出，发出(气味、热等)，用尽，筋疲力尽 ...
发出（光等）；长出（枝、杈等）
Plants in danger give off a sweet smell.
处于危险中的植物会散发出一种香味。
These lights should give off as little blue light as possible.
这些灯应该尽量避免发出蓝光。
The electric organ in its tail can give off electricity of 300-650 volts of electricity.
尾部的发电器官能发出300至650伏的电流。
They were not hot enough -- like stars-- to give off light.
VOA : special.2009.04.29
On day four, The heavenly bodies that give off light by day or night are created.
在第四天，那些在白天或者晚上发光的天体被创造了。
旧约导论课程节选 : 耶鲁公开课
It's basically get kids off the street and give them something to,
这基本上是为了不让一些孩子误入歧途，让他们有事可做，
SpeakingMax英语口语达人 : 布朗克斯的足球教练
We will cut that state off from the Confederacy, and give it to the alligators!"
VOA : special.2009.11.19
We may be able to use them later. So we may not be able to give them a job right off the bat, but the longer we stay, we're going to need the more people and hopefully the more people we can help,"
VOA : standard.2010.01.30
The two presidents give off different vibes but share abundant confidence and varied interests.
Cook says they give off a "cold creepiness" and make you feel like you're being interrogated.
Car batteries are filled with acid and can give off hazardous hydrogen gas if mishandled.