如题所述
å»ä¸æµ·åªè¦ä¸¤ä¸ªåå°æ¶.
It takes only 2.5 hours to go to Shanghai.
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ä¸æµ·Shanghai
åªè¦provided; so long as; as long as; if only; so as
åå°æ¶halfhour; half-hour