①If a place or object is enclosed by something, the place or object is inside that thing or completely surrounded by it.【v.包围;围住;封闭】
②If you enclose something with a letter, you put it in the same envelope as the letter.【v.把…封入信封;随函附上】
①The surrounding land was enclosed by an eight foot wire fence.
②I have enclosed a cheque for £10.
If you sound someone out, you question them in order to find out what their opinion is about something.
①He is sounding out Middle Eastern governments on ways to resolve the conflict.
②Sound him out gradually. Make sure it is what he really wants.
《金融时报》一篇题为Microsoft sounded out Pinterest on$51 bn deal for social media site的文章也提到了这个表达：
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