natural coagulation 指胶乳从胶树流出后、在不经任何处理的自然条件下，由于微生物和酶的作用而产生的凝固现象。 通常胶乳从胶树流出后4h就会发生自然凝固。
自然凝固工艺制备的nr热降解反应的表观活化能高于甲酸凝固工艺制备的nr热降解反应的表观活化能。
The apparent activation energy of thermal degradation reaction of the NR by natural coagulation is higher than that coagulated with the technology of formic acid.
先在灯灰中加入明胶、丁香末和冰片（樟脑的一种），然后将这种混合物倒入自己制作的模具中，待其自然凝固。
He combines lampblack with gelatine, crushed cloves and borneol, a variety of camphor. After pouring the mixture into moulds of his own creation, he allows it to set.
彩色玻璃凝固的礼拜仪式里，太阳的自然光线是人能够丰富它的美丽，并回奉与上帝。
In the frozen liturgy of the stained glass, the natural light of the sun enabled man to enrich its beauty and offer it back to God.
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