take advantage of利用,趁机利用,占…的便宜

例句：He took advantage of the situation.
      他得天时地利。

2.As of Monday, scientists said they had recorded 83 volcanic quakes and had raised the alert level to a level 3.

As of到...时为止
从...时起

例句：As of now, they won't return my e-mails.
      直至现在，他们还没有答复我的电子邮件。
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