Lacking an outlet, the Caspian Sea loses water only by evaporation, leading to the accumulation of salt.
由于没有排水口，里海的水量流失只能依赖蒸发，这也造成湖水中盐的积聚。
Ephemeral Lake Carnegie, in Western Australia, fills with water only during periods of significant rainfall.
短命的卡内基湖，位于西澳大利亚，只在重要的降雨时期充满水。
Ephemeral Lake Carnegie, in Western Australia, fills with water only during periods of significant rainfall. In dry years, it is reduced to a muddy marsh.
短命的卡内基湖，位于西澳大利亚，只在重要的降雨时期充满水。在干旱的年份里，它就变成了一个泥沼。
And whosoever shall give to drink unto one of these little ones a cup of cold water only in the name of a disciple, verily I say unto you, he shall in no wise lose his reward.
无论何人，因为门徒的名，只把一杯凉水给这小子里的一个喝，我实在告诉你们，这人不能不得赏赐。
Even then, the penguins are cautious; they stay in the water only long enough to feed, and they're adept at remaining motionless when they're on thin ice and spot a leopard seal.
尽管如此，企鹅也十分谨慎：它们仅仅在捕食时才呆在水下；一旦意识到冰面很薄或是附近出现海豹，它们就会紧紧地趴在冰面上，一动不动。
The Martian atmosphere contains only tiny amounts of water.
火星的大气层只含有微量的水。
The best prevention for cholera is to boil or filter water, and eat only well-cooked food.
预防霍乱最好的方法是把水煮沸或过滤，并且只吃煮熟的食物。
Only by using modern irrigation methods can we reduce water shortage in agriculture.
只有使用现代的灌溉方法，我们才能减少农业用水短缺的情况。
Sun clocks worked, of course, only on clear days; water clocks misbehaved when the temperature fell toward freezing, to say nothing of long-run drift as the result of sedimentation and clogging.
当然，太阳时钟只能在晴天工作；当温度下降到接近冰点时，水钟就会失灵，长期漂浮的东西因为下沉或堵塞而无法工作。
Saturn has a density of only 0.7 that of water, which means that Saturn would float in water.
土星的密度只有水的0.7倍，也就是说土星可以浮在水上。
The densities of the terrestrial planets average about 5 times the density of water, whereas the Jovian planets have densities that average only 1.5 times the density of water.
类地行星的密度的平均值大约是水的密度的五倍，而类木行星的密度平均值只有水的密度的1.5倍。
When the water level was high, the user needed only to descend a few steps to reach it; when it was low, several levels would have to be negotiated.
当水位高的时候，使用者只需要往下走几个台阶就能到达井的部位；当水位低的时候，就要走好几层了。
Flats and depressions where water can collect are common features, but they make up only a small part of the landscape.
可以集水的平原和洼地是它们共同的特征，但它们只占景观的一小部分。
Radars used to track storms can detect water in the atmosphere only once it has condensed into clouds or raindrops.
用于跟踪风暴的雷达只能在大气中凝结成云或雨滴后才能够探测到水。
At present, we can make efficient use of only naturally occurring hot water or steam deposits.
目前，我们只能有效地利用自然产生的热水或蒸汽沉积物。
Such actions as discharging waste water to rivers not only pollute the environment but also become a danger to people's health.
像排放污水这样的行为不仅污染了环境，还成为了人民健康的威胁。
Trade was the mainstay of the urban economy in the Middle East, as caravans negotiated the surrounding desert, restricted only by access to water and by mountain ranges.
因为商队只能通过水路和山脉进入沙漠，贸易就成为了中东城市的主要经济支柱。
Only the females of this cold-water fish sport a distinctive Pinocchio-like snout.
这种冷水鱼中只有雌性才能变异出独特的匹诺曹似的鼻子。
The water was only waist-deep so I walked ashore.
水只有齐腰深，所以我涉水上了岸。
The shower is easy to install – it needs only to be connected up to the hot and cold water supply.
淋浴器很容易安装–只需接上冷热水即可。
Early life-forms on Earth were confined to the oceans because water was the only available protection they had against ultraviolet radiation.
地球上早期的生命形式被限制在海洋里，因为水是帮助它们抵御紫外线辐射的唯一有效保护。
You might wonder how we can tell whether fossil animals lived on land or in water, especially if only fragments are found.
你可能想知道我们如何分辨化石上的动物是生活在陆地上还是水里，特别是如果只发现了化石碎片。
We all know that though 75% of the earth is covered with water, only 3% of it is fresh water.
我们都知道虽然地球75%都被水覆盖，但是其中只有3%是淡水。
While 75% of our planet is covered with water, only about 2% is fresh water that comes from rivers, lakes, ice and snow.
虽然地球的75%被水覆盖，但只有大约2%是来自河流、湖泊、冰雪的淡水。
Because warm air can hold more moisture than cool air, the relative humidity will be constant only if the amount of water vapor in the atmosphere increases as the temperature rises.
因为温暖的空气比冷空气能容纳更多的湿气，所以只有当大气中的水蒸气量随着温度的升高而增加时，相对湿度才会保持不变。
Paradoxically, while the temperatures required for liquid water exist only in the inner solar system, the key building blocks of life, including water itself, occur primarily beyond the asteroid belt.
矛盾的是，虽然液态水所需的温度只存在于太阳系内部，但生命的关键组成部分，包括水本身，却主要存在于小行星带之外。
Wasting food means losing not only life-supporting nutrition but also precious resources, including land, water and energy.
浪费食物不仅意味着失去维持生命的营养，还意味着失去宝贵的资源，包括土地、水和能源。
Having enough water isn't our only problem.
要拥有足够的水并不是我们唯一的问题。
Having enough water isn't our only problem.
要拥有足够的水并不是我们唯一的问题。
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