extensive research

• 广泛研究

extensive research的用法和样例：

例句

1. Extensive research has been done into this disease.
   对这种疾病已进行了广泛研究。
2. In the course of extensive researches it was found that water stored underground kept its temperature well.
   在广泛研究的过程中发现储存在地下的水能很好地保持着它的温度。