Definition: If a situation or activity involves something, that thing is a necessary part of it. Level: B1
旅行通常涉及大量步行。
The trips often ___involve a lot of walking.
这门课程涉及大量阅读。
The course ___involves a huge amount of reading.
这是一项学校间的比赛，涉及多种运动。
It is a competition for schools and it ___involves many kinds of sport.
