triple ( course ) surface treatment

• 三层表面处治

英英释义

名词 triple:

1. a base hit at which the batter stops safely at third base

2. a set of three similar things considered as a unit

3. a quantity that is three times as great as another

动词 triple:

1. increase threefold

2. hit a three-base hit

形容词 triple:

1. having three units or components or elements

2. three times as great or many