The force that makes two objects pull toward each other because of their mass — why a planet stays with a star, why you stay on the ground.

The force那個力 that makes two objects pull toward each other讓兩個物體互相吸引 because of their mass因為它們的質量 — why a planet stays with a star這就是為什麼行星會跟著恆星, why you stay on the ground為什麼你會留在地面上。

In school you will also hear gravity, which is the everyday word for the same idea, especially the pull of the Earth. Gravitation is the more scientific name, the one that shows up in Newton’s law of gravitation and in careful writing about how masses attract.

In school在學校裡 you will also hear gravity你也會聽到gravity這個字, which is the everyday word for the same idea它是同一個概念的日常說法, especially the pull of the Earth特別是指地球的引力。Gravitation這個字 is the more scientific name是比較科學的說法, the one that shows up就是出現在 in Newton's law of gravitation牛頓的萬有引力定律裡, and in careful writing about how masses attract以及嚴謹描述質量如何互相吸引的文章裡的那個字。

Though actually, teachers sometimes use the two as if they were exact twins; gravity often means ‘the Earth’s pull on us’, and gravitation the general force between any two masses. You do not need that split to use the word, but it is why a textbook may choose gravitation when it is being precise.

Though actually不過其實, teachers有些老師 sometimes use the two有時候把這兩個字用得 as if they were exact twins好像完全一樣; gravity常常 often means 'the Earth's pull on us'意思是「地球對我們的引力」, and gravitation而gravitation指的是 the general force between any two masses任何兩個質量之間的普遍的力。You do not need that split你不需要這樣區分 to use the word也能用這個字, but it is why不過這就是為什麼 a textbook教科書 may choose gravitation在講求精確的時候可能會選用gravitation when it is being precise。