蒂姆·鲍威尔曾是汽艇比赛冠军。Tim Powell is a former champion powerboat racer.鲍威尔-泰勒先生说人口的急剧减少使得该问题更加严重。Mr Powell-Taylor says that depopulation exacerbates the problem.鲍威尔的椎间盘破裂，在床上躺了一年。Powell ruptured a disc in his back and was laid u...
以二羧酸和异丁醇为原料,用硫酸作催化剂,合成二羧酸二异丁酯.The diisobutyl dicarboxylate was prepared by using acid and isobutanol as material and acid as catalyst.以冰醋酸、异丁醇为原料,硫酸高铈为催化剂合成乙酸异丁酯.A method for synthesis of isobutyl acetate based on ceric ...
They say hydrogen paroxide peroxide or carbime carbamide peroxide may also help.他们说过氧化氢或过氧化脲可能有作用.They say hydrogen peroxide or carbamide peroxide may also help.他们还认为过氧化氢和过氧尿素也有所帮助.Objective : To observe the therapeutic ...
The tiger prowled through the undergrowth.老虎悄然穿过矮树丛。I prowled around the lake admiring the beautiful scenery.我在湖边徘徊,欣赏美丽的景色.She prowled around the room like a caged tiger.她像笼子里的老虎一样在屋子来回走....