Precipitates are usually collected by centrifugation at intervals.常常是用离心法分段收集沉淀的.Try to get into the habit of eating at least three small meals a day, at equally spaced intervals.尽量养成每天至少吃3顿小餐的习惯，而且每餐的间隔要相同。She began to ...
George struggled wildly, going under and resurfacing at regular intervals.乔治疯狂地挣扎，不断在水面上浮浮沉沉。Make a point of backing up your files at regular intervals.一定要定期备份文件。The cartridge must be replaced at regular intervals.弹药必须定时...
...a cantankerous old man.牢骚满腹的老人a cantankerous old man爱抱怨的老头He met a crabbed, cantankerous director.他碰上了一位坏脾气、爱争吵的主管。a cantankerous and venomous-tongued old lady喜欢吵架、言语恶毒的老女人He was nothing but a narrow, ignorant, and ca...
His book about Afghanistan is reviewed here by Anthony Hyman.安东尼·海曼在此就他那本关于阿富汗的书写了书评。The trip to Afghanistan was an adventure for Helen.到阿富汗旅行对海伦来说是一次冒险的经历.Pakistan became a conduit for drugs produced in Afghanistan.巴基斯坦...