once upon a time
at a time in the past, often used to introduce a fairy tale or fictional story
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登录to exist
to have actual presence or reality, even if no one is thinking about it or noticing it
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登录state of the art
the latest or most advanced level of technology, design, or knowledge in a particular field
[短语]
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登录to estimate
to guess the value, number, quantity, size, etc. of something without exact calculation
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登录facial expression
a way of communicating emotions or attitudes through movements and positions of the face, such as smiling, frowning, or raising eyebrows
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