通常，贸易顺差以正数表示，贸易逆差以负数表示。
Generally, the trade surplus is maked by positive Numbers, and the trade deficit by negative Numbers.
正数表示“高于”谓词位置，负数则表示“低于”谓词位置。
Positive number for 'above' predicate positioning, negative number for 'below' predicate positioning.
正数表示“高于”谓词位置，负数则表示“低于”谓词位置。
Positive number for 'above' predicate positioning, negative number for 'below' predicate positioning.
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