The rationale for this rule is that you cannot distinguish an inherited work item from a direct one at first sight.

此规则的基本原理是您不能立刻从直接工作项中区分继承的工作项。

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Motion across the line of sight can be followed by direct observation.

与视线垂直的运动可以通过直接观测得到。

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By direct rapid smear method, contracted Sight-scale clock method and breeding of fecal flora, the fecal flora from 82 cases of different age groups were observed.

用直接快速涂片和缩小视野时钟法，检查粪便细菌分布，并与大便菌群培养及计数比较，我们观察分析了82例不同年龄组广东健康人君的肠道菌群变化。

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Now the camera can be triggered from up to 20 meters (66 feet) away, and a direct line of sight is not necessary.

ENGADGET: Nikon D5200 to reach US photographers in late January for $900

Infra-red communication suffers the same problems, but has the additional limitation of requiring a direct line of sight between objects as anyone who has tried to operate a television remote control with someone else standing between him and the television will know.

ECONOMIST: The human body as a computer bus

But the developed world has lost sight of direct productive activity.

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