I will spare no effort to study hard at English.
我不遗余力地努力学习英语。
You should spare no effort to study hard and catch up with the others.
你应该不遗余力地努力学习赶上其他人。
If you study, we will spare no effort to support you.
如果你学习，我们会不遗余力地支持你们。
If you study, we will spare no effort to support you.
如果你学习，我们会不遗余力地支持你们。
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