象氘一样，相对于氦- 4它是非常罕见的，但是不同于氢，氦不是来自化学混合物象水那样丰富。
Like deuterium, it is rare relative to helium-4, but, unlike hydrogen, helium doesn't form chemical compounds as abundant as water.
她有着极优雅紧凑、象尖锥一样微微弓着的脖子…那是我极爱看的部位，它是那样精确地汇入到高处的马隆肩。
She has the most exquisitely dry, tapered and slightly arched neck…I just want to look at her here and admire how correctly it flows into a high, correct insertion into the wither.
它是一个定量值，表明了用户观看或使用一个系统的主观评价和意见，不必要象绩效测量那样以任务完成所需的时间和错误数为指标。
A quantitative value representing the subjective rating or opinion of users reacting to seeing or using a system, as opposed to performance measures like task completion time or number of errors.
它是一个定量值，表明了用户观看或使用一个系统的主观评价和意见，不必要象绩效测量那样以任务完成所需的时间和错误数为指标。
A quantitative value representing the subjective rating or opinion of users reacting to seeing or using a system, as opposed to performance measures like task completion time or number of errors.
应用推荐