Nearly all of the cases have been among children younger than six, with most under two.
几乎所有患者都是六岁以下的儿童，其中大多数都不到两岁。
About 25, 000 units are under construction, with most due to come onto the market in two years' time.
在建的25,000套单元房大多将于两年后上市。
Although e-books and learn to read apps can prove useful, they are wasted on children under two-and-a-half, and are most effective when used with parents, the study found.
电子书对儿童学习读写有正面作用，但是如果孩子在两岁半以下，那纯粹是浪费时间。
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