The treatment of strings consisting of several words depends on whether the string is in quotes or not. Entering, for example, the string 'air temperature' without quotes for a search in the lexicon
returns all terms that have either 'temperature' or 'air' or both in the name or description.
Now, entering, the same string 'air temperature' with quotes for a search in the lexicon
returns only those terms that have exactly the string 'air temperature' in the name or description. In our case, only one entry matches this exact search string.
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