在新建的公寓预计完工一年之前，社会工作者就会打电话给那些可能希望迁回的住户。
More than a year before new buildings are scheduled to be finished, caseworkers call residents who might want to move back.
锯齿波从某一始点到某一终点沿着一条直线上升(或者下降)，在终点的时候它马上跃迁回其起始值。
A sawtooth wave rises (or falls) in a straight line from a starting point to an ending point, at which time it instantaneously jumps back to the starting value.
当我们迁回纽约时，两个孩子分别是9岁和11岁，最早在一所比较前卫的学校里上学，这里没有真正的考试，不打分，甚至连年度音乐剧的面试都没有。
When we moved back to New York City, my children, then 9 and 11, started at a progressive school with no real tests, no grades, not even auditions for the annual school musical.
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