氨气是无色的有刺激性味道的气体。
木器：最重要的是检查是否有刺激性味道。
Wood: the most important thing is to check whether there is a sharp taste.
而酸水解法只需两天，成品往往具有刺激性的味道、不透明和明显的化学香气。
The non-brewed sauces take only two days to make and are often opaque with a harsh flavor and chemical aroma.
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