The trains and subways in Tokyo serve thousands of commuters everday.东京的火车和地铁每天都接送成千上万的人上下班.Subways are really crowded at rush hour.高峰时刻,地铁一定很拥挤吧.The city subways carry hundreds of thousands of passengers a day.市内的地下铁每天运...
I'll bet the subways are crowded, too, aren't they?我想地铁也是那么挤, 是不是?The city subways carry hundreds of thousands of passengers a day.市内的地下铁每天运载数十万乘客.Subways are really crowded at rush hour.高峰时刻,地铁一定很拥挤吧....
组蛋白是一类结合在染色体上的蛋白质.Histones are a group of proteins that are associated with chromosomes.组蛋白是涉及到调控基因的蛋白质.Histones are proteins involved in regulating genes turned on and off.组蛋白的特点是大量的翻译后修饰,这些修饰可以影响基因转录.Histones are chara...