多数无害，可再矿化 5．釉质生长线 (incremental lines) 釉质生长线又名芮式线（Retzius line），在低倍镜下观察釉质磨片时， 此线呈深褐色。
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生长线
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counting incremental lines 沉积生长线
Salter incremental lines 索尔特氏增长线
incremental lines of ebner 埃伯牙本质生长线
incremental lines of cementum 牙骨质生长线
Incremental upgrades to existing lines could keep the railways from clogging.
ECONOMIST: High-speed rail
Many of the conventional, yet affordable, machines turned out great models, but often with the tell-tale lines of the incremental plastic layering.
ENGADGET: Formlabs FORM 1 high-resolution 3D printer spotted in the wild, we go eyes on (video)
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