a comparative study的用法和樣例：
例句
- Comparative studies about the activity of domestic trypsin and foreign normal temperature bating enzyme in different conditions were described.
作者對國產工業胰酶和國外常溫軟化酶進行了不同條件下的活力測定對比研究，並且進行了軟化應用對比實驗。 - Comparative study was conducted on a naturally injected aspirated high speed D.I. diesel engine to investigate the effects of diesel and methanol injection on the smoke.
在一台高速非增壓直噴柴油機上對進氣噴甲醇和純柴油的瞬態煙度排放兩種情況進行了試驗對比研究。
