Only the simple aperture sublingual gland is observed. Its shape is horseshoes, and the colour is amber.
舌下腺只有单口舌下腺，呈马蹄铁状，淡黄色。
The structure design and calculation and application of the aperture restrictor with simple structure, easy assembly and reliable usage are introduced.
本文介绍了一种结构简单、安装方便、使用可靠的缝隙节流器的结构、设计计算及应用。
The aperture field distribution of the ring focus antenna is reviewed in view of the energy conservation law, and the simple formula for calculating its radiation pattern is deduced.
该文从能量守恒观点出发，讨论了副面为椭圆的环焦天线的口径场分布，并导出了计算其方向图的简单表达式。
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