To decrease the number of head lice episodes per unit of time, control measures should include the treatment of all household contacts.
为了减少每个时间单位内出现头虱症患者的数量，应采取包括治疗所有家庭接触者在内的控制措施。
Figure 3 shows the relative impact on message throughput (messages processed per unit of time) associated with each of the four message formats discussed.
图3显示了上述四种消息格式对消息吞吐量(单位时间内处理的消息数)的相对影响。
The quote mentioned how many minutes the ship saileth in an hour, and the reason for this is that in this case a minute isn’t a unit of time, but a measurement of angle.
其实，上面一段引文中的第二个minute并非时间单位。它不是我们熟知的“分钟”，而是角度单位：分。
Reaction rate: Speed at which a chemical reaction proceeds, in terms of amount of product formed or amount of reactant consumed per unit of time.
反应速率：化学反应进行的速度，用单位时间内产物的生成量或反应物的消耗量来表示。
Frequency is a measure of the number of occurrences of a repeating event per unit of time.
频率即衡量单位时间里重复事件发生的次数。
A unit of time corresponding approximately to one cycle of the moon's phases, or about 30 days or 4 weeks.
月大约和月亮盈亏的一个周期相当的时间单位，或约三十天或四周。
Countries whose workers produce a large quantity of goods and services per unit of time enjoy a high standard of living.
一个国家的工人单位时间内能生产大量的商品和服务，那么这个国家享受较高的生活水准。
Income is a flow of earnings per unit of time. Money, by contrast, is a stock: it is a certain amount at a given point in time.
收入是某一单位时间内收益的流量，而货币是一个存量，即某一时间点上一个特定的金额。
It was found in the study that the use of ultrasonic wave increased the concentration of O3 per unit of time because of ultrasonic dispersion;
研究发现，超声可以通过超声粉碎作用，增加单位时间内O3的浓度；
Note that while the unit of time of the return value is a millisecond, the granularity of the value depends on the underlying operating system and may be larger.
注意，当返回值的时间单位是毫秒时，值的粒度取决于基础操作系统，并且粒度可能更大。
Note that while the unit of time of the return value is a millisecond, the granularity of the value depends on the underlying operating system and may be larger.
注意，当返回值的时间单位是毫秒时，值的粒度取决于基础操作系统，并且粒度可能更大。
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