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Neodumetiasangawani 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。
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。
The special differential staining methods for inclusion body of insect virus affords us a useful methods, which check up on inclusion body of insect virus under the light-microscope.
昆虫包含体病毒特异性的鉴别染色方法为我们准确地在光学显微镜下检查包含体病毒提供了有益的方法。
As a useful tool, computer has been widely used in the entomological research works including insect classification.
计算机作为一种昆虫分类的工具，已广泛用于昆虫的数值分类和支序分类中。
Olfactory plays important roles in the behavior of insects, illustrating the olfactory mechanism will be useful to regulate insect behaviors for effective pest control.
嗅觉是昆虫产生行为的重要物质基础，阐明昆虫嗅觉机理有助于调控昆虫行为和进行害虫治理。
A dressing-gown and a thick waist-coat were useful provisions against abrupt changes in the weather. Insect powder should also be among the items packed;
睡衣和雨衣能对付这里变化无常的天气，还有杀虫粉可灭虫、挂衣钩能栓在柱子上挂衣服；
A dressing-gown and a thick waist-coat were useful provisions against abrupt changes in the weather. Insect powder should also be among the items packed;
睡衣和雨衣能对付这里变化无常的天气，还有杀虫粉可灭虫、挂衣钩能栓在柱子上挂衣服；
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