kāi cháng ㄎㄞ ㄔㄤˊ 开长 开启并助长。《后汉书·郎顗传》：“其当迁者，竞相荐谒，各遣子弟，充塞道路，开长奸门，兴致浮伪。”
弯曲件展开长度 blank length of bends
展开长度 spread length ; developed length ; stretched length
钣金展开长度 Developed length
开长方体 open rectangular parallelepiped
展开长 developed length
圆弧的展开长度 Developed Length for Arcs
渐开线展开长度 Involute rolling length
长开襟 Deep placket ; Dee lacket ; Deep plair coolingket
帧开始长度 start of frame length
扫描开始长度 start of scan length
他有许多要说明的，但又没时间开长会，所以只好把一份长汇报削短成半小时的简介。
He had a lot to explain, and no time for more than a short meeting. Thus a lengthy briefing had to be telescoped into half an hour.
公司里开会时- - -特别是开长会时- - -很容易让人产生当一把精神病医生的冲动。
During a meeting at work — especially a long meeting — it can be tempting to play the psychiatrist.
住在偏远郊区的人，他们距离工作和购物的地方，往往相隔甚远；也就是说他们需要开长路去上班工作和购买日用所需。
People living in poorly designed suburbs are also usually geographically isolated from their jobs and shops, meaning that they have to drive to get everything they need.
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