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A
a variety of 各種不同的
abide by (= observe) 遵守
above all 尤其重要的是
be absent from 缺席
be absorbed in 專心於
account for (= explain) 解釋;說明
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Advanced Test 1
The United States population is growing older. In 1987, 12 percent of Americans were 65 years old or older, compared with 8 percent in 1 .. << 詳全文 >>