spans信息详情
n.[建]跨度；一段时间（span的复数）
v.跨越；持续；贯穿（span的第三人称单数）
attention spans───[心理]注意广度；注意力的持续时间
Travellers get from one side to the other by walking across a footbridge that spans a little stream.───旅游者通过一座横跨小溪的人行桥从一边走到另一边。
Geographic isolation also can proceed slowly, over great spans of time.───地理隔离也可能在很长一段时间内进展都非常缓慢。
These episodes of rapid evolution are separated by relatively long static spans during which a species may hardly change at all.───这些快速进化的阶段被相对较长的静态跨度分隔开来，在此期间，一个物种几乎不会发生任何变化。
Knowing about a particular instant or partial time snippet can be useful, but it's also often useful to be able to express spans of time.───了解特定的时刻或是某个局部时间片段将非常有用，但是如果能够表达一段时间跨度的话，通常也很有用。
A brief section giving background information may be necessary, especially if your work spans two or more traditional fields.───对背景知识做一个简要的介绍有时候也是必要的，特别是当你的研究领域涉及到两个或更多方面的传统领域。
Remember that anything rendered after you set a color uses the same color and that this spans over frames and will not be reset in-between.───当你在多帖之间，设置同一个颜色之后，它将不会自动重新设置。
There have already been some of these applicable to shorter time spans than I use in reporting to partners.───在比我向合伙人汇报的时间段更短的时期里，已经有了一些大范围波动的情况。
A handful of researchers, however, think science will ultimately delay aging at least long enough to double life spans.───大量研究人员认为，科学将最终推迟变老速度，使人类寿命至少可以达到预期生命期限的两倍。
The bridge spans over Qiantang River, as if it is a magnificent rainbow.───大桥如飞虹，跨钱塘江两岸，颇为壮观。
An old bridge spans the river just outside the town.
A bridge spans the river there.
The Brooklyn Bridge spans the East River from Brooklyn to Manhattan.
A robin's song spans less than an octave.
The time-scale involved is seldom measurable, but spans many generations.
A small bridge spans the arm of the river.
Young children have quite short attention spans.
The bridge, which spans the moat, is 140 feet long and 30 feet wide.
Her stage career spans sixty years.