And then with  information from the MPAA I figured out how many movies were being released every decade.

然后根据MPAA的信息，我计算出每十年发行电。

However, the MPAA is saying that this is probably not appropriate, probably not suitable, for children under the age of 13.

然而，MPAA 表示这不适合 13 岁以下的儿童。

You don't have to send your movie in to the MPAA in order to have it rated, but if you don't, most theaters probably won't show it.

您不必将电发送给 MPAA 就以对其进行评级，但如果不这样做，大数不会放映。

Most of these ratings were created in the late 1960s, when the MPAA decided that it needed to have very clear guidelines, very clear rules about movies and what rating they should receive.

大数这些评级是在 1960 年代后期创建的，当时 MPAA 决定它需要有非常明确的指导方针， 非常明确的关于电的规则以及他们应该获得的评级。