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小于90度的角叫銳角.Angles of less than 90 degrees are called acute angles.他的年齡不會小于三十歲.He cannot be under thirty years of age.這些人承受的壓力往往小于那些職位僅次于他們的人。Such people often experience less stress than those in the ranks immediately be...

“小于”的英語可以翻譯為：[計] less-than，less than ...