A waveguide is characterized by a region of high refractive index bounded by regions of lower index.
波导就是折射率高的区域由折射率低的区域包裹的结构。
The core has a high index of refraction, whereas the surrounding cladding, with its air holes interspersed with silica, has a lower index.
核心的石英折射系数高，环绕在外的外层石英与孔洞交错，所以折射系数较低。
The covering material that encases the core of an optical fiber. the cladding material usually has a lower index of refraction than the core material and may be either glass or plastic.
一种包装光纤芯的保护材料。保护材料的折射率通常比光纤芯的折射率低，它一般是玻璃或塑料。
This year's rise, an average of 2.7 percent, may be a fraction lower than last year's, but it is still well above the official Consumer Price Index (CPI) measure of inflation.
今年的平均涨幅为2.7%，虽然可能略低于去年，但仍远高于官方的消费者价格指数（CPI）所反映的通胀水平。
In fact, a recent study found that yoga devotees have a lower body mass index (BMI) than other exercisers do.
事实上，最近的一项研究发现瑜伽爱好者比其他的锻炼者的体重指数都要低。
Researchers claim both partners are more content if the woman has a lower Body Mass Index (BMI) than the man.
研究者们声称，当女性的体重指数比男性低时，夫妻双方更有满足感。
Asian stocks pulled back from initial steep falls, with Japan's Nikkei 225 index recovering from an opening fall of 1.8% to close 0.63% lower.
随着亚洲股票从最初的暴跌变得持续稳定，日本的日经225指数也逐渐恢复，从原来下跌的1.8%降低到0.63%。
Vegetarians tend to have a lower body mass index and lower overall cancer rates.
素食主义者的身体质量指数一般较低，患癌症的几率也比较低。
The index contains a node that is a small array of Pointers to the lower level.
索引包含一个节点，该节点是一个小型的指针数组，这些指针又指向更低的层。
Vegetarians tend to have a lower body mass index (BMI) and lower overall cancer rates.
素食者往往身体质量指数(BMI)较低并且总体癌症发病率也较低。
Steep declines in most of the second half of 2008 mean that the American index is still more than 20% lower than a year earlier.
2008年下半年就业指数的急剧下跌意味着美国的指数比一年前的要低20%还多。
The Dow Jones industrial average fell more than 110 points in morning trading, led lower by Cisco. The technology-heavy Nasdaq composite index tumbled 2 percent.
道琼斯工业平均指数开盘后下跌超过110点，思科公司跌幅居前，科技股为主的纳斯达克综合指数下跌2%。
The lower this value is the more likely the optimizer will choose to scan the grid index.
这个值越低，优化器就越有可能选择扫描网格索引。
Boys exposed to high levels tend to have a longer ring finger relative to their index finger, while in males exposed to lower levels, the two fingers tend to be a similar length.
暴露在高水平性激素环境里的男孩，其无名指相对于他们的食指更长，而低水平环境中，这两根手指趋近于等长。
In index tracking, the bigger you get, the lower your costs, and the more closely you follow the index.
在指数跟踪方面，规模越大，成本越低，你跟踪的指数越准确。
In London, the FTSE 100 index ended just 0.1 per cent lower, with mining stocks suffering most.
伦敦富时100指数收盘仅下挫0.1%，跌幅最深的是矿业类股。
The Vix, or volatility index, a measure of market preparedness for shocks, has been lower than in past peaks-though it shot up on September 17th.
衡量市场对意外冲击是否有所准备的波动指数VIX尽管在9月17日暴涨，仍然低于之前的峰值。
Findings suggest that major extensions of sleep time may not be necessary, as an extra 20 minutes of sleep per night seems to be associated with a lower body mass index, "it added." we.
同时该研究还显示：“我们的调查结果表明没有必要大量增加睡眠时间，每晚多睡20分钟似乎有助于降低体重指数。”
Eat lower on the glycemic index (GI).
吃血糖指数(GI)低的食物。
The Case-Shiller index may have risen in May but it remained 17.1% lower than a year earlier, when prices had already been falling for almost a year.
更不用提达到峰值了五月份，Case - shiller指数也许已经上升，但是同一年前相比，仍然低17.1个百分点。在近一年的时间里，价格不断下跌。
There has been a modest improvement since then, but the total index is still 5% lower now than in 1996.
2000年以来虽说有些许改善，但是其总指数仍比1996年低5%。
Food with a low-glycemic index (LGI) causes blood glucose levels to increase more slowly and to lower levels compared to high-carbohydrate foods with a high glycemic index.
低胰岛素指数食物(LGI)比高胰岛素指数食物升高血糖的速度慢，引起的血糖峰值也更低。
At the same time, the producer price index declined 2.1 percent in November from a year earlier. The rate of decline was 3.7 percentage points lower than that in October.
同时，11月生产商价格指数比去年下降了2.1% .这个降幅率比10月下降了3.7%。
The latest Case-Shiller indices, released on June 30th, showed that prices continued to fall in April: the ten-city index was 0.7% lower than a month earlier, and the 20-city index went down by 0.6%.
6月30日发布的最新Case - Shiller指数显示，四月房价继续下跌：十城市指数较一个月前下跌0.7%，二十城市指数下跌了0.6%。
But Berkshire outperformed the index over the lion's share of the credit crisis, since losses in 2008 were far lower than the broader market's.
不过伯克希尔在信贷危机大多数时候的表现好于标普指数，因其2008年的损失远低于整体市场。
Dark fiber-rich whole wheat bread is lower on the index; its spike is slightly less sharp.
纤维丰富的全麦面包拥有较低的血糖指数，它造成的血糖上升很少。
Futures pegged to the Dow Jones industrial average fell more than 250 points in electronic trading Sunday evening, pointing to a sharply lower open for the blue chip index Monday morning.
周日晚的电子交易中，道琼斯工业指数期货股指下跌了超过250点，同周一早上开盘的蓝筹股指数相比是大幅下滑。
In fact, research shows that people who start their day with breakfast make healthier choices and have a lower body mass index in general.
事实上，研究表明人们选择吃早饭是健康的选择，并且吃早饭的人总体上体重指数更低。
Being at the lower end of the healthy Body Mass Index range (which is between 18.5 and 24.9) also offers protection against diabetes and heart disease.
处于健康身体指数范围(在18.5到24.9之间)的末端也能预防糖尿病和心脏病。
Being at the lower end of the healthy Body Mass Index range (which is between 18.5 and 24.9) also offers protection against diabetes and heart disease.
处于健康身体指数范围(在18.5到24.9之间)的末端也能预防糖尿病和心脏病。
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