那男孩大约八九岁。
[误] The boy was about eight or nine years old.
[正] The boy was eight or nine years old.
注：about 意为“大约”，three or four o\'clock(三点或四点/三四点钟);eight or nine years old 也是表示“大约”的时间，因此再用 about 就重复了。
