(1)“X times + as +形容词或副词原级+ as”,译为“A是B的X倍”。如:The substance reacts three times as fast as that one.(这种物质反应的速度是那种物质的3倍。)(比那种物质快2倍)
(2)“X times + 形容词或副词比较级+ than”,译为“A是B的X+1倍”或“A比B大(多、长等)X倍”。如:The cotton output was four times greater than that of 1996.(棉花产量比1996年增产4倍。)(是1996年的5倍)
(3)“X times + the width (length, breadth, level, value.etc.) of”,译为“A是B的X倍” 或“A比B大(多、长等)X-1倍”。如:The lake is twice the width of that lake.(这个湖的宽度是那个湖的2倍。)(比那个湖宽一倍)。
(4)“half as many (much, long, etc.) as”,译为“A是B的一半”。如:I have half as many books as she has.(我的书只有她的一半多。)
注意:①2倍通常用twice, duple, twofold表示(不可以用two times),译为“翻一倍”或“是……的两倍”。如:You are twice her age.(你的年龄比她大一倍。)②大于或等于3倍通常用“X times”表示。They have produced four times as many washers as they did last year.(他们今年生产的洗衣机相当于去年的四倍。)