限制生奶销售这一法规在20世纪前半叶证明是全国公共卫生上的一大成功。
The regulation of raw milk sales in the first half of the 20th century proved to be a major public health success in this country.
节（茎上生叶处）茎上的点，此处长叶或有叶子；节点。
The point on a stem where a leaf is attached or has been attached; a joint.
顶端分生组织上的侧生突起发育成叶的原基，与原形成层有关。
Leaf buttress a leaf primordium, appearing as a protuberance on the side of the stem apex, produced by periclinal division of the tunica and corpus, and associated with a procambium.
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