Although it has a long shelf life, instant coffee may go solid if it is not kept dry.
尽管速溶咖啡能够放置很长一段时间，但是如果不能保持干燥的话很快就会坏掉。
On the other hand, the solid is NOT dry ice (carbon dioxide solid).
另一方面，该固体不是干冰(二氧化碳固体)。
The substrate must be dry, solid, and free from dust.
墙面基层必需干燥、牢固、无尘埃。
The substrate must be dry, solid, and free from dust.
墙面基层必需干燥、牢固、无尘埃。
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