All levels of heuristic analysis add processing overhead to scanning time, and for some products, the slower performance can be all too obvious.

所有的启发式分析等级都占用多余的处理器时间，并且很多反病毒产品使用启发式分析时很明显的降低系统性能。

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The best scanning time is about 74 seconds. On continuing observation, the scanning interval should be a little longer and it will not lose the time of observation.

扫描开始时间应以74秒前后为佳，持续观察时，扫描间隔时间宜长，且不会错过观察时机。

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Objective: to study the effects of respiratory movement frequency and scanning time on the image results in the treatment of lung cancer by stereotactic radiotherapy.

目的：研究立体定向放射治疗肺癌中呼吸运动频率与图像扫描时间对靶体积定位成像结果的影响。

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Meanwhile,Google continues scanning truckloads of books at a time.

VOA: standard.2009.12.31

He had no mechanical ability, but his wife, Edith, whom he met at Brandeis, recalls that when they went to the college library Walt would spend time scanning architecture magazines.

NEWYORKER: Critical Mass

Scanning fingerprints adds time as well as security.

ECONOMIST: Can biometrics make banking more secure?

In such cases, wait time, if any, would be short because customers have already done the time-consuming chore of scanning and packing up groceries.

WSJ: Mobile Checkout Devices Let People Scan and They Shop