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たまたま， 偶々， 偶偶， 偶， 適
1. by chance, by accident, accidentally, happen to (be, do), unexpectedly, casually
2. occasionally, once in a while, now and then
tbd
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並ぶ， 列ぶ， 双ぶ， ならぶ
1. to line up, to stand in a line
2. to rival, to match, to equal
排队、排列；排成一行；与之竞争；与之相当；与之相等
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
