当水开始沸腾时，“嗒”的一声！
当水被抽出来时，剩余的空间被上层的泥土填满压实。
As the water is pumped out, the vacant space left is compacted by the weight of the earth above.
当水通过植物细胞的细胞壁，它会从含盐量最低的一侧进入含盐量最高的一侧。
When water moves through the wall of a plant cell, it will move from the side containing water with the lowest amount of salt into the side containing the highest amount of salt.
当水到达合适的水位时，幼鸟就会被一条腐蚀性的沟渠保护，免受捕食者的伤害。
When the water hits the right level, the baby birds are kept safe from predators by a corrosive ditch.
我小心翼翼地走进游泳池，但当水涨到我的肚子时，我再次失去平衡，掉进了水里。
I stepped carefully into the swimming pool but when the water came up to my stomach, I lost my balance again and fell into the water.
当水从板下的一个腔中被抽出来产生负压时，可伸缩的传感器被向下拉，形成一个凹形。
When water is pumped out of a chamber below the plate creating negative pressure, the stretchable sensors are pulled down, producing a concave shape.
当水从海洋表面蒸发时，往往会留下较重的同位素，所以剩余的海水会逐渐富含氧18这种同位素。
Heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18.
当水在火上沸腾时，将茶倒入锅中。
Put some tea in a galipot when the water is boiling on the fire.
但是当水在球里面会发生什么呢？
当水开始沸腾时，关小炉火。
当水开的时候，把水加到面条里面去。
当水滞留在耳内并使细菌或真菌滋生时就会生这种病。
It happens when water gets trapped in your ears and allows bacteria or fungi to flourish.
随着气温的升高，当水的需求增长时，水资源就显得匮乏了。
With temperatures projected to increase, water may be limited at a time when demand is growing quickly.
这是根据先前当水因冷凝由气态变为液态时，气压骤降而得出的。
They base this on the previously unconsidered drop in pressure that occurs when water passes from gas to liquid state in condensation.
当水被搅动时，就会将这些化学物质释放到空气中然后被人体吸入。
As the water is agitated, these chemicals are released into the air and then breathed in.
热水器有自动控制功能，当水达到设定温度的时候就自动断电了。
The water heater has self-control functions and cuts off power after the water temperature reaches the setting.
当水在上层大气中凝固，会形成细微的，扁平的，六面体形状的冰晶。
As water freezes in the upper atmosphere, small, flat, six-sided, ice crystals might be formed.
在火星上有大量的冰块，但是当水结冰时，形成生命的化学反应就会停止。
There is plenty of ice on Mars, but the chemical reactions for life come to a halt when water freezes.
这项技术很有效，因为当水从海里蒸发，氢和氧的同位素组合升空形成云，接着飘至陆地上空降雨。
The technique works because when water evaporates at sea, a combination of hydrogen and oxygen isotopes rise to form a cloud, which then releases rain when it moves inland.
这项技术的确有效，因为当水从海中蒸发后，氢和氧的同位素升起形成云，接着当它飘至陆地上空时再变为雨。
The technique worksbecause when water evaporates at sea, a combination of hydrogen and oxygenisotopes rise to form a cloud, which then releases rain when it moves inland.
而能保持这一庞大水系统洁净的则是由泥土、植物、动物组成的网络。当水不接触它们时，这个系统就不能再保持正常了。
What keeps this vast system clean is a web of earth, plants and animals; when water cannot be in touch with these it is no longer a sustainable and healthy system.
当他在瀑布边缘小心攀爬时，水飞溅到他左边。
The water roiled to his left as he climbed carefully at the edge of the waterfall.
当大量的水涌入时，一半以上的城市都被淹没了。
When a lot of water comes, more than half of the city is underwater.
当春天来临时，水变暖了，鱼开始游来游去。
When spring comes, water gets warm and fish start to swim around.
罗马人观察到，当火山灰与水混合然后冷却，火山灰变得非常坚硬，几乎不可能分解。
The Romans observed that, when volcanic ash mixes with water and then cools, it gets extremely hard and almost impossible to break up.
当接缝和裂缝扩大形成空洞时，大量的水也会被储存在石灰岩中。
Large quantities of water may also be stored in limestones when joints and cracks have been enlarged to form cavities.
当考虑水的实际体积时，问题变得更加复杂：每条支流会有多少水流进及流出呢？
The questions become more complicated when actual volumes of water are considered: how much water enters and leaves by each route?
当考虑水的实际体积时，问题变得更加复杂：每条支流会有多少水流进及流出呢？
The questions become more complicated when actual volumes of water are considered: how much water enters and leaves by each route?
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