Parasaurolophus have learned there's safety in numbers.

它们知道只有群居才更安全。

So, they wait for others to arrive. There's safety in numbers.

所以它们等候大部队一同抵达。数量越多就越安全。

Suggest a group date if your parents won't let you go out alone. Your parents are concerned about your safety, and there's safety in numbers.

如果父母不允许你单独外出，建议多人一起约会。你的父母担心你的安全，多多注意安全事项。

Steve lets his daughter go on a school trip even though he won't let her spend a night away with a friend on the principle that there's safety in numbers.

即使史蒂夫原则上不让其女儿与朋友在外过夜，但他还是让她参加学校组织的旅行，他认为参加集体活动比个人活动安全。