节食和锻炼可以控制体重，但你必须坚持不懈地坚持自己的计划。
Dieting and exercising can bring your weight under control but you must stick to your plan with perseverance.
帮助一个孩子打破消极的自言自语的习惯并不容易，你必须坚持不懈。
Helping a child break the habit of negative self-talk is not easy. You'll need to be consistent.
但你也必须坚持不懈地努力来提高你的写作技能。
But you should also consistently work on sharpening your skills.
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