over-trading和under-trading 有关贸易的术语,有没有确切的解释.

over-trading和under-trading 有关贸易的术语,有没有确切的解释. 怎么区分over和under 怎么区分over和under under-crank 和over-crank怎么翻译? trading above、over,below和under的区别50字就好 under,below,over,above四个词的用法和区别 Over And Under 歌词 under stated is over 足彩UNDER OVER trading Co.,Ltd.和Trading Company的区别 what is both over and under the water but doesn't touch water Under And Over It 歌词 负片over,正片under是什么意思 above和over的区别并且below和under的区别可以快点吗？急急急 trading company 和agent的区别 to,up,down,around,across,from,over,under 从以上单词中选填空 Don't jump___and___.It's dangerous. Don't ___your things______,please A.keep;over B.find;order C.leave;about D.left；under要分析