Editorial Note: This article is written with editorial review and topic relevance in mind.
Pg和gg是两种用于表示质量的单位。 首先，pg代表拍克（petagram），是国际单位制（si）中的一种大质量单位。 1 pg等于10^15克，即1万亿克。 拍克通常在天文学、环境.
Why Is the 'Barbie' Movie Rated PG13? Plus, Can Kids Watch?
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