She is studying hard for fear that she should lag behind others.

她学习很刻苦，唯恐落在别人后面。

youdao

She is working hard for fear (that) she should lag behind others.

她很用功，唯恐落在别人后面。

youdao

Perhaps personality dictates, her heart Victory particularly strong, not willing to lag behind others, treat their own requirements too stringent.

也许是性格使然，她的好胜心特别强，不愿意落后于人，对待自己要求太过严格。

youdao

Currently Asian countries lag behind others in environmental regulations, relying instead on voluntary initiatives like the one introduced in Singapore last year.

CNN: Shipping looks to clean up its act