Thirty divided by two is fifteen.
三十除以二得十五。
Methods The thirty cuvettes were divided into two groups randomly, fifteen cuvettes in every group.
方法30支试管随机分两组，每组15支试管。
Scores from zero to three in the game of tennis are"love","fifteen","thirty","forty" respectively.
网球比赛中的得分从零至3依次是“零”“15”“30”“40”。
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