to contain
to have or hold something within or include something as a part of a larger entity or space
包含, 包括
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登录to promise
to tell someone that one will do something or that a particular event will happen
承诺, 答应
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登录to worry
to feel upset and nervous because we think about bad things that might happen to us or our problems
担心, 忧虑
[动词]
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登录letter
a written or printed message that is sent to someone or an organization, company, etc.
信件, 信
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