a comparative study的用法和样例：
例句
- Comparative studies about the activity of domestic trypsin and foreign normal temperature bating enzyme in different conditions were described.
作者对国产工业胰酶和国外常温软化酶进行了不同条件下的活力测定对比研究，并且进行了软化应用对比实验。 - 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.
在一台高速非增压直喷柴油机上对进气喷甲醇和纯柴油的瞬态烟度排放两种情况进行了试验对比研究。
