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他挥动帽子表示告别。
He bade his farewell by waving his hat.
youdao
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他脱下帽子表示敬意。
He removed his hat as a sign of reverence.
youdao
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这上面有一个帽子表示它是单位矢量,T表示它是切线。
It has a hat because it's a unit vector, and t because it's tangent.
youdao
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这上面有一个帽子表示它是单位矢量,T表示它是切线。
It has a hat because it's a unit vector, and t because it's tangent.
youdao