2.They are doing a (科学的) experiment.真格在线教育

2.They are doing a (科学的) experiment.真格在线教育
2.They are doing a (科学的) experiment.真格在线教育

2.They are doing a (科学的) experiment.真格在线教育
填scientific .
形容词,意思是 科学的,系统的
例句：
Most students in our class go in for scientific activities
我们班上大多数学生参加各项科学活动.

scientific