A typical example is the halogenation of a hydrocarbon.典型的例子是碳氢化合物的卤化.Addition Reactions to Alkynes, Hydrogenation , Halogenation and HX. Hydration of alkynes. Tautomerization.炔烃的加成, 氢化,卤化和HX. 炔烃的水化作用,互变异构化.In these meth...
Life on Earth will become unsustainable unless population growth is held in check.人口增长要是不加控制的话，地球上的生命将无法持续发展。The story in Estonia and Lithuania is similar — and looks equally unsustainable.爱沙尼亚和立陶宛情形也与之相似,都不能持续下去.No one ...
The caffeine in coffee can jangle the nerves.咖啡中的咖啡因会使神经紧张。We react to stresses such as the jangle of telephones or the wailing of police sirens.我们对于电话的叮铃声,警笛的尖啸声之类使人紧张的情况总要作出反应.When the strangled wrangler dangles the ma...