该天盖壁是双层厚的。
首先进行强度和稳定性计算，主要进行了筒体、端盖的壁厚计算、水压试验应力校核以及叶轮、轴的强度校核。
First of all, for strength and stability, mainly a cylinder, cover the wall, the water pressure check and impeller stress test, the axis of strength checking.
窦的壁衬盖着内吞细胞，这些细胞能吞食淋巴中可能出现的任何一种外来颗粒。
The walls of the sinuses are lined with endocytic cells which engulf any foreign particles that might be present in the lymph .
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