present importance的用法和樣例：
例句
- The study on river reaeration is of great importance to the control of riverpollution.
河流復氧研究對於河流污染治理具有重大的現實意義。 - Under the present favorable situation of hydropower development, it has great significance to reconsider the construction period of hydropower project.
在目前水電大開發的有利形勢下，重新認識水電工程的建設工期，具有重要的現實意義。
