let-off pipe排放管;出水管
let-off system送经装置
let-off mechanisms送经机构
let-off motion送经装置;送经运动
electronic let-off电子送经;电子卷取
let-off ratio送经比
friction let-off摩擦式解卷装置
Let-off mechanism[纺] 送经机构
let-off warp送经
Structure and working mechanism of adjustable let-off motion areintroduced ,taking looms 1515 as an example ,to which reliabity analysis and specification is given.
以1515织机为例，详细介绍了调节式送经机构的构造、调节原理、可靠性分析及有关参数的确定。
参考来源 - 调节式送经机构的优化设计 Optimization of Adjustable LetThe fourth chapter finishes some research and design of let-off & take-up motions based on servo control. The specific application in engineering and tension control are also introduced.
第四章对基于伺服控制的送经及卷取机构进行研究和设计，介绍了具体工程应用中的主要工作和张力控制。
参考来源 - 剑杆织机运动控制研究PHRASAL VERB（动词词组） If someone in authority lets you off a task or duty, they give you permission not to do it. 免除 (任务或义务)
I realized that having a new baby lets you off going to boring dinner parties.
我意识到，生了个孩子你就可以不参加无聊的宴会了。
PHRASAL VERB（动词词组） If you let someone off, you give them a lighter punishment than they expect or no punishment at all. 宽恕
Because he was a Christian, the judge let him off.
因为他是一个基督徒，法官宽恕了他。
PHRASAL VERB（动词词组） If you let off an explosive or a gun, you explode or fire it. 放 (枪炮等); 使爆炸
A resident of his neighbourhood had let off fireworks to celebrate the revolution.
他邻里的一个居民燃放了烟花来庆祝革命。