useful insect的意思|示意

It can be useful to filter out external stimuli if you are writing an email in a noisy coffee shop, for example, or are searching for a camouflaged insect in a rainforest.

例如，要是你在在嘈杂的咖啡馆里写一封电子邮件或在雨林里搜寻一只伪装的昆虫，能过滤掉外部的刺激就很有用。

A bee is a very useful insect.

蜜蜂是十分有益的昆虫。

A natural predator indigenous to India, Neodumetia sangawani, was found useful in controlling the Rhodes grass-scale insect that was devouring forage grass in many parts of the US.

人们发现来自印度本土的食肉动物 Neodumetia sangawani 有助于控制在罗德岛草场大规模泛滥的昆虫，这种昆虫吞食了美国多地的草场。