题目

想请英语语法老师解释下句型中的语法现象.
1.Geneticists explain that since closely related persons are more likely to harbor identical genetic mutations,their children have a greater chance of being born with defects
请解释下其实中的are more likely to harbor的语法现象.
2.Although the risk is still significant,it is lower than previously thought.
请解释下其中的 than previously thought 的语法现象.

提问时间：2020-11-01

答案