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1·The more intense contrast lies in the following 2 lines that the pairs of swallows perching her eave made more noticeable to serve as a foil to her loneliness and desolation;

反差更大的是在后二句，与她同一屋檐下的燕子成双成对，现出了她孑然一人的孤独凄清；

2·To analyze the disputed materials in this historical biography can make out that Simaqian had deliberately overdrawn Confucius's ability just in order to serve as a foil to his tragic life.

对这篇史传中有争议材料的分析，可以看出司马迁之所以对孔子才干刻意夸大，是为了反衬孔子不幸的悲剧命运；

3·Product itself is the absolutely important factor in newspaper drug advertising and models are used scarcely, but in recent years models who serve as a foil to the product is increasing gradually.

产品本身在广告中始终占绝对优势，模特运用总体比例偏低，但近年来与产品搭配使用、处于次要地位的模特形象上升较快。