Of course, other variables, both known (dedicated bagger) and unknown (payment type, coupons, cigarettes) affect on the speed of the line, but this is a good rule of thumb to use as a baseline.

当然，有些变化的因素，诸如知道的因素(专业装袋工)和不知道的因素(结账方式，优惠券，香烟)会影响速度，但是这是一个不错的基础准则。

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If your site is rather new and still unknown, a good way marketing technique is to get involved in the community around your topic.

如果你的网站是全新的且不为人知，参与与你网站主题相关的社区是一个很好的推广方法。

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We are naturally skeptical of the unknown and, of course, there is always a chance we might not be very good at it, or even worse, might look silly while trying.

我们对于未知事物有天然的怀疑，而且，我们当然可能对其并不擅长，或者更糟的是，在尝试时洋相百出。

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Modernist ambiguity, or realist emotional ambivalence, is unknown to Tolkien the good people are very good, the bad people very bad, and though occasionally a character may be tossed between good and evil, like Gollum, it is self-interest, rather than conscience, that makes him tip back and forth.

NEWYORKER: The Dragon��s Egg

Rana who was suffering from some unknown disease, the Rana ruler had a good rapport with British Monarchs, so he requested the British govt. to send a british physician to cure him.

FORBES: The Health Care Reform Reference Post

It is not unknown for good scientists to go off the rails at the end of their careers, and Fred Hoyle did so in spectacular style.

ECONOMIST: Sir Fred Hoyle