Freezing can keep some foods in good condition for months after the growing season.
VOA: special.2009.11.30
We have to change the approach if things aren't working but we have to keep after it.
必须改变现有的方式,不论是否会有成果。
It is important to keep going after you finish this course.
在完成这一课程后,进一步的学习非常重要。
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