我们说服他参加可费了一番周折。We had the devil's own job to persuade him to take part.费了不少周折, 他们方到达大门.After much difficulty and jolting, they reached the gate.我们费了不少周折才找到一套空闲的公寓房间.We had a lot of bother finding a vacant apartment....
the registration of letters and parcels信件和包裹的挂号She was burdened with a large quantity of parcels.她吃力地捧着一大堆包裹.He spent two hours tying all the parcels with string.他花了两个小时用绳捆扎所有这些包裹....
The suitable organic imine reactants have a variety of compositions and structures.合适的有机亚胺反应剂具有多种组成和结构.The alternative use of buffered silica gel resulted in modest hydrolysis ( ~5 - 10 % ) of the imine.选用温和的水解导致缓冲硅胶 ( ~...
I walked up one road , down another , expecting to stumble on something recognizable.我东投西奔, 指望撞见认得的东西.Should my feet sometimes stumble on the way. stay with me.我的双腿有时会在途中绊倒, 所以请陪伴我.A horse may stumble on four legs.马有四条腿,...