Nocturnal animals such as bats and owls only come out at night.夜行动物,如蝙蝠和猫头鹰只在夜里才出来.The usual symptoms are dyspnea, and sometimes paroxysmal nocturnal dyspnea.其常见症状是呼吸困难, 有时呈阵发性夜间呼吸困难.I wander about the dread nocturnal co...
It is hard to see how people will get through the winter.难以想象人们将怎样熬过这个冬天。The window was far too small for him to get through.窗户对他来说实在太小，他钻不过去。You'll get through at least ten nappies a day.你每天至少得用10块尿布。...
Therefore , one cannot ignore the contribution of biogenic volatile organic compounds to the secondary organic aerosols.二次有机气溶胶由于其对环境 、 气候和人体健康的影响,正日益受到人们的关注.Dihydroxyindole is an important intermediate of melanin, amino...
N, N - diethylaniline was synthesized under normal tempreture with tetraethyl ammonium hydroxide as phase transfer catalyst.以苯胺和溴乙烷为原料,用四乙基氢氧化铵作相转移催化剂,在常压下合成N, N二乙基苯胺....