In 1960, American families ate out at restaurants much more often than Japanese and British families and the average frequency ratio was 1.2:0.2:0.4 times per month.

　　51.1970年美国家庭外出就餐的平均次数依然保持遥遥领先，平均每月2.4次，同时，英国家庭的外出就餐次数也大幅攀升至1次，而日本家庭的外出就餐次数只有稍微的一点增长，达到0.4次。

　　In 1970 American families still took the lead in terms of the times of eating out at restaurants, averaging 2.4 times per month. Meanwhile, British families also saw a big increase in the frequency of eating out, rising to 1 time per month while Japanese families only showed a slight increase in this respect, averaging 0.4 time per month.

　　52.1980年美国和日本家庭外出就餐频率继续大幅攀升，分别达到每月3.2次和1次，而英国家庭在这方面则只增长了0.2次，维持在每月1.2次。

　　In 1980, there were substantial increases in the number of times of eating out for American and Japanese families, reaching 3.2 times and 1 time respectively. However, there was only a slight increase by 0.2 time for British families, standing at 1.2 times per month.

　　53.1990年对于美国家庭来讲是外出就餐增长最快的一年，从3.2次增长到了6.4次，同时，英国家庭追上了日本家庭，两者皆达到了1.4次。

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