Keep on working hard and be persistent.
be persistent可以用stick to it代替
keep going and persevere unremittingly.
Keep going，keep trying等均为继续努力之意。
西方老师表扬、鼓励学生还常说：Keep it up！
keep trying and to be perseverance
keep trying and be persistent
Continue to persevere
to continue upholding
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