当然是充话费赠的
首先,附加动作给人的直感是“附加”“动作”,即extra
action。
其次,看看bonus action的(部分)描述:
Bonus Actions
Various class features, spells, and other abilities let you take an additional action on your turn called a bonus action. The Cunning Action feature, for example, allows a rogue to take a bonus action.
You can take a bonus action only when a special ability, spell, or other feature of the game states that you can do something as a bonus action. You otherwise don’t have a bonus action to take.虽然我不知道为什么要这么设计,但是确实就是充话费(获得某个使用bonus action的能力)送的。