牛津词典对此的解释是此时的slow是副词。尤其用比较级或最高级形式时。等于at a slow speed.
Slow adverb
/sləʊ/ /sləʊ/
(slower, slowest)
used especially in the comparative and superlative forms, or in compounds. at a slow speed.
Could you go a little slower?
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