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1 ?上颌硬区 36 36 3、上颌硬区(hard area) 位于上腭中部的前份,骨 组织呈嵴状隆起,表面覆盖的 黏膜较薄,故受压后易产生疼 痛，覆盖该区的基托组织面 应适当缓冲，以防产生... 2 ?硬区 ... hard arc ==> 强电弧 hard area ==> 硬区 hard asbestos refractory ==> 硬石棉耐火垫 ...
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The danger is likely to continue, they say, until the waves reach an inland area of hard rock which will not be eaten as limestone is. 他们说，这种危险可能会持续下去，直到海浪到达内陆坚硬的岩石区域，这些地方的岩石不会像石灰岩那样受到侵蚀。 - 2
Back in the 1900s, some stop signs were yellow because it was too hard to see a red sign in a poorly lit area. 早在20世纪初，一些停车标志是黄色的，因为在光线不好的地方很难看到红色标志。 - 3
We enrolled him in our local area educational agency preschool, where the teachers worked hard to help Skyler connect with the world around him. 我们为他在当地的教育幼儿园报了名，园内的教师努力地帮助斯凯勒与他周围的世界建立联系。
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