10个你应该知道的日常生活科学知识英文双语对照

为什么海水是咸的？

海水中溶解了大量的矿物质，其中氯化钠占了最大比例。海水中氯化钠的浓度大约是每升35克，这就是海水咸的主要原因。

为什么天空是蓝色的？

天空呈现出蓝色，是因为大气对太阳光的散射。在日落时分，太阳光路径变长，蓝色光线被散射得更多，所以我们看到的天空是橙色或红色的。

为什么香蕉会氧化变黑？

香蕉表面受到空气中氧气的影响，氧化酶会催化氧化反应，使香蕉表面生成黑色素。为了延缓这一过程，可以在切开的香蕉上涂抹一些柠檬汁。

为什么火车轮子是球面的？

火车轮子之所以是球面的，是为了减小摩擦力，增加行驶的稳定性。球面的设计可以使轮子更容易转动，减少能量损失。

为什么冰会浮在水面？

冰浮在水面的原因是，冰的密度比水的密度小。当水温下降至0摄氏度以下，水分子会形成结晶网格，使得冰体积膨胀，密度减小而浮在水面上。

为什么太阳会在东方升起在西方落下？

这是因为地球自转和公转的交替造成的。地球自西向东自转，太阳距离地球近，所以看起来是从东方升起，在地球转过180度后，太阳开始落到地平线下。

为什么人造卫星能够在空中飘浮？

人造卫星的运动速度与地球引力达成平衡，所以它可以维持在空中飘浮。这是一种匀速直线运动与地球引力的平衡状态。

为什么切洋葱会流泪？

切洋葱时，细胞壁遭到破坏释放出一种挥发性化合物，这些化合物被吸入呼吸道后与眼泪中的水分结合，生成了刺激性的硫酸，引发了眼泪。

为什么鸟会在冬天飞往南方？

鸟类根据季节和资源分布进行迁徙，冬季南方温暖，食物丰富，适宜繁殖。这是鸟类为了生存和繁衍的一种自然选择。

为什么月亮会有阴晴圆缺？

月相变化是由于月球围绕地球运动造成的。月球自身没有光，我们看到的月亮是阳光照射在月球表面的结果，月球围绕地球运动时，太阳照射在月球不同位置，所以呈现出阴晴圆缺的现象。

感谢您阅读本文，希望这些科学知识能让您更加了解日常生活中的种种现象。

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英文翻译对照，仅供参考

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Why is seawater salty?

Dissolved in seawater many mineral, among them sodium chloride held the largest proportion. The chroma of the sodium chloride in seawater is every litres of 35 grams about, this is the main reason with salty seawater.

Why is the sky blue?

The sky presents a blue, because atmosphere is right,be of sun's rays scattering. In sunset time, sun's rays method lengthens, blue light is gotten by scattering more, the sky that so we see is orange or red.

Why can banana oxidize blacken?

Banana surface gets the influence of the oxygen in air, oxidation is enzymatic reaction of meeting catalysis oxidation, make banana surface makes melanin. To postpone this one process, can go up in the banana of incision daub a few lemon juice.

Why is train wheel spherical?

Train wheel is spherical, it is to reduce attrition force, increase the stability of travel. Spherical design can make wheel turns more easily, reduce energy loss.

Why to put meeting float on the ice to be in surface?

Glacial float is in the reason of surface is, glacial density is smaller than the density of water. When water lukewarm drop to 0 Celsius the following, water element can form crystallization reseau, make glacial bulk expands, density is reduced and float is on surface.

Why can the sun rise to fall in the west in east?

Because,this is of earthly rotation and revolution cause alternately. The earth from on the west eastwards rotation, sun distance earth is close, it is eastwardly it seems that so rise, turn in the earth after crossing 180 degrees, the sun begins to fall to horizon.

Why can orbiter hang in sky?

The athletic speed of orbiter and earthly gravitation reach an equilibrium, so it can be maintained float in sky. This is a kind of divide evenly fast the balance position of sharp movement and earthly gravitation.

Why to cut onion to you can weep?

When cutting onion, cellular wall is destroyed release a kind of volatile compound, these compound by with tear medium moisture is united in wedlock after inspiratory respiratory tract, generated excitant vitriolic, caused tear.

Why can the bird fly to south in the winter?

Avian basis season and resource distributing undertake flight, winter south is warm, food is rich, appropriate breed. This is avian choose for a kind of nature that live and multiplies.

Why can the moon have Yin Qing circle to be short of?

Change of phase of the moon is caused. Moon oneself does not have light, the moon that we see is sunshine illuminate the result in moon face, when the moon moves around the earth, sun illuminate differs in the moon the position, present the appearance that circle of fine giving nether world is short of so.

Thank you to read the article, hope these scientific knowledge can let you understand a variety of phenomena in daily life more.