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¡¡¡¡a is n times smaller £¨lighter£¬ slower£¬¡­£© than b.

¡¡¡¡ÒÔÉÏÁ½¾ä¾ùÓ¦ÒëΪ£ºaµÄ´óС£¨ÖØÁ¿£¬Ëٶȣ¬¡­¡­£©ÊÇbµÄ1/n[»òa±ÈbС£¨ÇᣬÂý£¬¡­¡­£©£¨n-1£©/n].

¡¡¡¡e.g. The hydrogen atom is near1y l6 times as light as the oxygen atom.      ÇâÔ­×ÓµÄÖØÁ¿Ô¼ÎªÑõÔ­×ÓµÄ1/16£¨¼´±ÈÑõÔ­×ÓÔ¼Çá15/16£©¡£

¡¡¡¡e.g. This sort of membrane is twice thinner than ordinary paper.      ÕâÖÖ±¡Ä¤±ÈÆÕֽͨÕÅÒª±¡Ò»°ë£¨¼´ÊÇÆÕֽͨºñ¶ÈµÄ1/2£©¡£

¡¡¡¡×¢£ºµ±Ïà±ÈµÄ¶ÔÏóbºÜÃ÷ÏÔʱ£¬than/as b³£±»Ê¡È¥¡£

¡¡¡¡£¨¶þ£©decrease n times/n¡ª¡ªfold

¡¡¡¡decrease by n times

¡¡¡¡decrease by a factor of n

¡¡¡¡ÒÔÉÏÈýʽ¾ùÒëΪ£º¼õÉÙµ½1/n[»ò£º¼õÉÙ£¨n-1£©/n].

¡¡¡¡decrease³£±»reduce£¬shorten£¬go£¯slow downµÈ´ÊÌæ´ú¡£

¡¡¡¡e.g. Switching time of the new-type transistor is shortened 3 times.      ÐÂÐ;§Ìå¹ÜµÄ¿ª¹Øʱ¼äËõ¶ÌÁË1/3£¨¼´Ëõ¶Ìµ½2/3£©¡£

¡¡¡¡e.g. When the voltage is stepped up by ten times£¬ the strength of the current is stepped down by ten times.      µçѹÉý¸ß9±¶£¬µçÁ÷Ç¿¶È±ã½µµÍ9/10£¨¼´90£¥£©¡£

¡¡¡¡e.g. The equipment reduced the error probability by a factor of 5.      ¸ÃÉ豸Îó²î¸ÅÂʽµµÍÁË4/5.

¡¡¡¡£¨Èý£©there is a n-fold decrease/reduction¡­      Ó¦ÒëΪ£º¼õÖÁ1/n [»ò£º¼õÉÙ£¨nÒ»1£©/n].

¡¡¡¡Õâ¸ö¾äÐÍ»¹ÓÐÆäËüһЩÐÎʽ£¬

¡¡¡¡e.g. A rapid decrease by a factor of 7 was observed.     ·¢ÏÖѸËÙ¼õÉÙµ½1/7.

¡¡¡¡e.g. The principal advantage of the products is a two-fold reduction in weight.      ÕâЩ²úÆ·µÄÖ÷ÒªÓŵãÊÇÖØÁ¿¼õÇáÁË1/2.

¡¡¡¡Ó¢ÓïÔÚ±íÊö»ò±È½Ï±¶Êýʱ£¬ÎÞÂÛʹÓÃʲô¾äÐÍ£¨³ýÁ˲»º¬±¶Êý´ÊµÄagain¾äÐÍÍ⣩¶¼°üÀ¨»ù´¡±¶ÊýÔÚÄÚ£¬Òò´Ë¶¼²»ÊǾ»Ôö»ò¾»¼õn±¶£¬¶øÊǾ»Ôö»ò¾»¼õn-1±¶¡£