30 percent of reptiles, birds, and fish are currently threatened with extinction.目前，30%的爬行动物、鸟类和鱼类面临灭绝的危险。She threatened to publicly expose his double life if he left her.她威胁说如果他离开她，她就将他双重人格的生活方式公之于众。Kaifu threatened to ...
A million is written with six noughts.一百万写出来有六个零。Using binary notation is in fact just manipulating ones and noughts.使用二进制标号法实际上只运用1和0两个数.When you write down in figures the number one million, how many noughts are there?...