基团反应，族反应
reaction───n.反应，感应；反动，复古；反作用
unfailing reaction───经久不衰的反应
mixed reaction───[经] 意见不一；各种不同反应
cationization reaction───阳离子化反应
natural reaction───自然反应
synthesis reaction───合成反应
reaction times───反应时间（reactiontime的复数）
inhuman reaction───非人反应
alchemical reaction───炼金术反应
Probably not, said Justine Roberts, the co-founder of online parenting group Mumsnet. "My gut reaction is that parents would worry about them distracting lessons."───恐怕不会的”，在线育儿组织Mumsnet的共同创办人Justine Roberts说道，“我的本能反应就是家长们会担心孩子们上课不认真听讲。”
They recruited a group of video-gamers and compared their reaction skills with a group of non-players. The gamers had all spent at least five hours a week on action games in the previous year.───他们招募了一组电子游戏玩家——这些玩家在以往每周至少玩5个小时的动作游戏——把他们的反应能力与一组非玩家比较。
They recruited a group of video-gamers and compared their reaction skills with a group of non-players.───他们招募了一批游戏玩家，并比较他们与非游戏玩家之间在反应技能上的差异。
The Exploration of Positive Solution of a Group Reaction Diffuse Equation───一类反应扩散方程正解的爆破
Singular Perturbation for Nonlinear Species Group Reaction Diffusion Systems───非线性种群反应扩散系统的奇摄动
Group reaction hachures of a relief feature───地貌晕线
The effect of the ratio of hydrogen peroxide to double bond of allyl group, reaction temperature and reaction time on epoxidation was investigated.