这就是为什么洋葱能使你的眼泪不自主的流下：洋葱内不同组分的化学物质混合在一起形成了一种不稳定的酸；
This is why cutting onions can make you cry: chemicals stored different compartments of the onion cell mix together to form an unstable acid;
在三岁以前，胃酸分泌处于低水平，对酸不稳定的药物，例如青霉素的吸收会增强。
Before then, the stomach has low levels of acid, and acid-labile drugs, such as the penicillins, show enhanced absorption.
涟钢CSP生产线于2004年2月份正式投产以来，钢中酸溶铝的控制不稳定，酸溶铝命中率低。
Since the CSP assembly line of Liangang on February, 2004 putting formally into production, the control of acid-soluble aluminium in steel wasn't stable, and hitting ratio was low.
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