He is unwilling to lag behind.

他不甘落后。

youdao

She is very strict with herself in her English study and unwilling to lag behind.

她对自己的英语学习要求很严格，不甘人后。

youdao

So we moved, to march forward courageously, athlete shouted is unwilling to lag behind the spirit, if not the spirit, sports will lose its true meaning.

使我们为之感动，为之高呼的是运动员勇往直前、不甘落后的精神，如果没有这种精神，体育将失去其真正的意义。

youdao