And then this one, we had bf, and now we've got gf.
然后这个，我们有 bf，现在我们有 gf。
来源: Engvid-Gill Course CollectionSo let's write these key points out about gravitational forces, which I'm going to use GF to represent.
那么让我们写下关于引力的这些要点，我将用 GF 来表示。
来源: Khan Academy Middle School Physics - NGSS Middle School PhysicsAnd then this one, we had bf, and now we've got gf.
然后这个，我们有 bf，现在我们有 gf。
来源: Engvid-Gill Course CollectionSo let's write these key points out about gravitational forces, which I'm going to use GF to represent.
那么让我们写下关于引力的这些要点，我将用 GF 来表示。
来源: Khan Academy Middle School Physics - NGSS Middle School Physics探索常用高频词汇