色氨酸，一种非常重要的氨基酸，也是血清素(让人感觉良好的化学物质)的前导，会转换成褪黑色素，刺激加强松弛感和愉悦。
Tryptophan is an essential amino acid that ACTS as a precursor of serotonin - the feel-good chemical - and can be converted to melatonin, eliciting relaxation and pleasure.
松弛的皮肤香烟中含有4000多种化学成分，其中大部分物质都会伤害人体的骨胶原和弹。
Sagging Skin There are more than 4,000 chemicals in tobacco smoke, and many.
使用一种松弛迭代的方法来处理化学源项的刚性问题。
The stiffness problem of chemical source is overcome by a relaxation iterative scheme.
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