心包由两个不同的亚层组成：坚固的外纤维心包和内浆液心包。
The pericardium consists of two distinct sublayers: the sturdy outer fibrous pericardium and the inner serous pericardium.
VIP表达主要位于视网膜光感受器外节、内核层、内网状层和脉络膜，神经节细胞层和神经纤维层也有弱表达；
The expression of VIP exists on photoreceptor- outer segment, inner nuclear layer and inner plexiform layer of retina and choroids, and weak expression exists on ganglion cell and nerve fiber layer.
基于武汉长江隧道工程项目，研究应用高抗渗纤维混凝土作隧道管片外保护层。
Based on the Wuhan Yangtse River tunnel project, the low-penetration fiber concrete as the protecting layer of Wuhan Yangtse River tunnel tube was studied.
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