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to decide you are going to do something and to put a lot of effort into doing it
决心要，一心想
If you'd just put your mind to it, I'm sure you could do it.
如果你一心扑在那上面，我肯定你能完成。
And I'm sure if you put your mind to it, you can come up with an even better lemon meringue pie than mine.
而且我敢肯定，如果你真的用心去做的话，你可以做出比我更好的柠檬蛋白酥皮卷。