Psychologists have suggested there are two types of envy: malicious envy and benign envy (van den Ven et al., 2009).

心理学家提示有两种嫉妒：恶性嫉妒和良性嫉妒(van den Ven等人2009)。

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But the usefulness of the CARDS may vary according to the mosquito species and the geographical region, van den Hurk says.

然而，范·登·向克表示，这些卡片的实用性可能还和蚊子的种群以及地理区域有关。

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Next, van den Hurk will compare the sensitivity of the approach with those of other standard methods, such as the use of animals.

接下来，范·登·向克将会将这种方法和其它的标准方法——比如动物的方法——进行比较，以此来判断这种方法的灵敏性。

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Van den Wildenberg said it was not clear who was responsible for the attack.

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Jacco Verhaeren, coach of Pieter van den Hoogenband, said the Australian's biggest attribute was his determination.

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"I would entertain another 2x to 3x drop in cost down the road, " says Van Den Berg.

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