educational ladder是什么意思

educational ladder是什么意思 教育制度是education system还是educational system? DNA ladder 和DNA maker是同样的东西么 he went down the ladder.哪个是介词? ladder是什么意思? educational名词 educational是什么意思 educational mix educational attainment 英语翻译customer shall install cable ways for the supporting structure (hereinafter cable ladder) of cable trays which provide by Indracable ladder怎么翻?Indra怎么翻?cable ladder是用来放桥架的。indra肯定不是因陀罗。 电泳时marker是如何选择的?100bp DNA ladder是指什么? 英语翻译是 tips for going on an educational exchange to the USA还是 tips for going to the USA for educational exchange还是 tips for educational exchange in the USA哪个好,有没错 “at the top of the ladder tree” 是“名列前茅”的意思吗 英语翻译社会阶层英语考破了，我们学的是social ladder都没人说。 教育部门是educational department 还是education department?因为我看健康部门,是Health Department? 请问 ladder spreader 是什么东西这是上下文：Prior to using a step ladder,the following is to be checked:􀂃 the ladder spreader is not damaged or missing and the locking mechanism is operable;􀂃 the ladder spreader has not 高的文化水平用英语怎么说?是用什么词来形容educational background呢? higher up the ladder