Aspirin is synthesized through O - acylating reaction from acid and anhydride acid with anhydrous carbonate as catalyst.以水杨酸和乙酸酐为原料,采用无水碳酸钠作为催化剂经O - 酰化反应合成了阿司匹林.One advisable way is to synthesize NFM acylating morpholine...
Allen, don't you dare go anywhere else, you hear?艾伦，其他地方哪儿都不准去，听到了吗？Men are anxious to improve their circumstances, but are unwilling to improve themselves; they therefore remain bound.--James Allen人们总是渴望改善周遭环境，但是却不...
It's a devastating and barbaric act that defies all comprehension.这种行为野蛮凶残、令人震惊，简直是不可理喻。What Jock had done was beyond my comprehension.我无法理解乔克的所作所为。The vastness of space defied comprehension.外层空间的茫茫无垠让人无法弄清其究竟....
Our dog has had three litters of puppies.我们的狗已经生了三窝小狗.Glass from broken bottles litters the pavement.人行道上满是破碎瓶子的玻璃渣。He always litters a desk with papers.他总是将桌上零乱地堆满了文件....
He made substantial donations to charity...他为慈善事业捐了很多钱。Some donations are already trickling in.一些捐赠已经陆续到来。Donations came from all kinds of people...捐赠来自于各界人士。Charities appealed for donations of food and clothing for vict...