vt.

1. 加强，增强；使变激烈
   His absence only intensified her longing.

   他不在身边唯使她愈益渴念。

2. 【摄】加强（明暗度），强化（潜影）

vi.

1. 增强，强化；变激烈
   The war intensified.

   战争变得激烈了。

v.

1. make or become more intense.
2. Photography  increase the opacity of (a negative) using a chemical.