The diisobutyl dicarboxylate was prepared by using acid and isobutanol as material and acid as catalyst.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.Butyl cinnamate was synthesized from cinnamic acid and butyl alcohol using tungstosili...
Acid rain is not straightforwardly attributable to the burning of coal.酸雨并非简单地由烧煤造成。Nor is acid rain always, and universally, a bad thing.酸雨也并非在任何情况下都是坏事。This comedy of contemporary manners is told with compassion and ac...
The two sides exchanged fire with artillery, mortars and small arms.双方交火时动用了大炮、迫击炮和轻武器。Rockets, mortars and artillery rounds rained on buildings.火箭炮、迫击炮和各种炮弹如雨点般落在大楼上。They could not move their heavy mortars over the swam...
But the relief operation has been hampered by a series of aftershocks.但是救援工作被一系列的余震所阻止.Freezing weather in spring hampered the hens' ability to lay.春天严寒的天气降低了母鸡的产蛋能力。So thought every harassed , hampered, respectable...
为改变鼻子的形状，她甚至接受了整形手术。She even had plastic surgery to change the shape of her nose.画一些简单的形状让孩子涂上颜色。Draw simple shapes for your child to colour in.人体骨架是由依靠韧带连接的形状相异的骨头构成。The skeleton consists of differently shaped bones hel...