by slow degrees

• adv. 慢慢(一点儿一点儿地)

例句

用作副词 (adv.)

1. He let himself down slowly by means of a tope.
   他借助一根绳子慢慢地下来了。
2. The room grew cold by insensible degrees.
   这房间不知不觉地慢慢地变冷了。