usuallyoften属于副词词性
例句
1.
Third, over 6/ 10 of the teachers investigated say they usually or often request their students to read textbook before ( or after) lessons and to be active in classroom, while the students' read less than they were expected.
超过6/10的被调查教师总是或经常要求学生在课前（或课后）阅读教材、在课堂上进行活动，而学生的相应回答比教师的回答要低得多。
2.
Specialized platforms are usually simpler and often provide some unique services.
专门平台通常比较简单，常常提供某些独特的服务。
