| 词组 | an |
| 释义 | the • per • a/an - It's £3 a kilo/per kilo. (preferable to the) - We were doing 40km an/per hour. (Not *the hour*) - Take this twice a/per day. (Not *the day*) (a/an for one unit of measurement; per = 'each' is emphatic and formal) - Eggs are sold by the dozen. (Not *a/per*) - Our car does 30 miles to the gallon. (preferable to a/per) (the in prepositional phrases) |
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