The students are going to take the test in two days' time.意思是：学生们准备在俩天后就接受测验.请问：能否改成The students are going to take the test in two days.它俩有什么区别?还有：在俩天内怎么说?

The students are going to take the test in two days' time.意思是：学生们准备在俩天后就接受测验.请问：能否改成The students are going to take the test in two days.它俩有什么区别?还有：在俩天内怎么说?
The students are going to take the test in two days' time.意思是：学生们准备在俩天后就接受测验.
请问：能否改成The students are going to take the test in two days.它俩有什么区别?
还有：在俩天内怎么说?

The students are going to take the test in two days' time.意思是：学生们准备在俩天后就接受测验.请问：能否改成The students are going to take the test in two days.它俩有什么区别?还有：在俩天内怎么说?
不能照你的改.
你的说法意思是：学生们要花两天来进行考试.
也可以用：within two days