1.If there is an improvement in something, it becomes better. If you make improvements...previous thing or situation, you mean that it is better than that thing. an improvement on something = 表示進步而超越了something (這時的something是給被進步的東西比較而...
2. Improvements of 3 existing field stations 3. Expansion into 3-track standard... of 176 commuter trains 1. Completion of embankment and drainage improvement work between Taipei and Shin-Chu. 2. Completion of...