Charles Wortmann at the University of Nebraska-Lincoln says a one-time tillage may be used to correct a problem like aggressive weeds.

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They are very aggressive to be type-A people who just simply made two extra hours out of their 24-hour day.

他们渴望成为上等人,甚至希望每天,能多过两个小时。

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and it's a really aggressive sport

很有攻击性的运动，

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You had to consider the risks of doing nothing or having a fairly aggressive surgery like gastric bypass -- or doing something a little less aggressive like the Lap-Band, also called the adjustable laparoscopic banding system.

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The trick to these is that you may want to move from a more aggressive to a more conservative fund as you get closer to your retirement date.

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During the 1990s, EPA adopted a very aggressive interpretation of a provision of the 1964 Civil Rights Act which applied to state use of federal funds, Title VI.

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