The best signal depends not only on its brightness but also on how well it contrasts with the background against which it must be seen.
最好的信号不仅取决于它的亮度,还取决于它与背景的对比度。
By selling the helium, the government can not only pay off that debt but reduce its overall debt as well.
政府通过出售氦不仅可以偿还债务,还可以减少总体债务。
The tourist attraction, which was well-known for its torrential waterfall, now only has a mild flow in the rainy season and becomes even thinner in winter.
即使雨水季节,瀑布也只有"一根线",到了冬季则更加纤细。
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