21512—four-week improvement programs are offered during vacations at a wide range of different levels to meet students' needs. 3794
想问：
1—are offered:本句怎么翻译？
1—four-week improvement programs are offered：
be offered：被提供给... 被提供...
翻译：4周的提高计划被提供给
2—during vacations at a wide range of different levels to meet students' needs.
vacation：假期 at：以 不要翻译成在 during vacations ：假期期间
wide range of ：各种
翻译：假期期间以各种不同的水平去满足学生的需求。