The tomatillo is covered with a thin membrane, or calyx, that is a brownish orange color with purple veins.
树蕃茄或花苞是用一个稀薄的膜被盖，那是一种褐色橙色颜色与紫色静脉。
The colors used in the drawings are conventional medical artist colors, with arteries in red and veins in purple or blue.
示意图中所使用的色彩是常规的医学标记色彩：动脉为红色，静脉为紫色或蓝色。
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