If something is within your grasp, it's likely to be accomplished.

如果某件事在你的掌握之中，那么它很可能会被实现。

If something is within your grasp it is very likely that you will achieve it.

如果某件事在你掌握之中，你很有可能会实现它。

Every two dimensional vector is within your grasp.

每一个二维向量都在你的掌握之中。