YOU SAID:

Alice and Bob are involved in some activity (such as skiing) in which crashing into other people is fairly common.

INTO JAPANESE

アリスとボブは、他の人と衝突することがよくあるアクティビティ (スキーなど) に参加しています。

BACK INTO ENGLISH

Alice and Bob are participating in an activity (such as skiing) that often involves conflict with other people.

INTO JAPANESE

アリスとボブは、他の人々と衝突することが多いアクティビティ (スキーなど) に参加しています。

BACK INTO ENGLISH

Alice and Bob are participating in an activity (such as skiing) that often involves conflict with other people.