The entire arrangement makes it easy for this bifocal fish to spot a tasty bug flying above the water, or a bit of algae below.

这个构造使四眼鱼能够很轻松地发现一只从水面飞过的美味的虫子，或者水面下的一点水藻。

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Because it needs clean water to survive, the new bug is a crucial "index species" that could be used to gauge a river's health, NIBR's Min-Ha said.

因为它必须在干净的水源地生活，因此它可以被看作是检验水质标准的生物。

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The giant water bug, or Lethocerus indicus, a three-inch-long South Asian insect that looks uncannily like a local cockroach, is just one of the items on the menu of this bug-eating bacchanal.

这只三英寸长，有着一副宛如家里蟑螂一般的尊容的南亚大水虫，或者叫它田鳖，仅仅是食虫菜单上的许多道菜之一。

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