either of the horny front wings in beetles and some other insects which cover and protect the functional hind wings 同义词：wing case,
例句与用法
1.
In this order the forewings are modified to form hard elytra or cases . 该目昆虫的前翅发展成坚硬的鞘翅或壳。
2.
When the mist arrives , o . unguicularis tilts its body forward into the wind , and moisture rolls down its fused elytra into its mouth 当雾气来袭，沐雾甲虫会把身体前倾入风中，好让水气顺著黏合的翅鞘滚入口中。
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