phase in

汉语翻译

英语解释：

动词 phase in:

1. introduce gradually

例句：

1. The production lines were phased in last year.
   这些生产线，是去年逐渐引进的。
2. The use of lead-free petrol is now being phased in.
   无铅汽油的应用现正逐步推广。