(1)To put that in perspective, in the United States, a person typically gets a radiation dose of 6.2 millisieverts per year. 从客观的角度看来，在美国，一个人通常一年受到的辐射量为6.2毫西韦特。

(2) To put that in perspective, it reaches 128 m.p.h. in the timeit took you to read thewords can reach a speed of 128 m.p.h. in 3.5 seconds. 换个方式说，当你读完“过山车在3.5秒内达到128英里每小时”这几个字的时间里，过山车就可以加速到128英里每小时的速度。

(3) To put that in perspective, the current level of CO2 in the atmosphere is 387 parts per million. 总的看来，现在的大气中二氧化碳含量为万分之三点八七。

疑问：以上到底哪个是正确的？如何推断出来？