The prices were a tad above average, but they're of the highest quality.价格比平均水平略高，可它们的质量是最好的。The risk of epidemics may be slightly higher in crowded urban areas.人口稠密的城区爆发流行性疾病的风险可能略高些。The new system is only marginally more efficient than the old one.新系统的效率比旧系统仅仅略高一点。