这个项目包括十五个开发人员和测试人员，各自分成两个团队。
The project involves fifteen developers and testers, separated into two teams, respectively.
密度很重要，比如每五个词中有两个关键词比每十五个词中两个关键词要有效。
Density is important; i.e. 2 keywords for every 5 words counts more than 2 for every 15.
短短两个月内就有十八个整师、九个旅和十五个团被歼。
Eighteen full divisions, nine brigades and fifteen regiments within the space of two months were wiped out.
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