A red sky at sunset may mean that there are clear skies to the west, where the sun sets. A red sky at sunrise usually means that the clear weather has already passed, so storms might be coming.
日落时天空呈现红色，这可能意味着太阳落山的西方天空晴朗。日出时天空呈现红色，则通常意味着晴天已经过去，所以暴风雨可能即将来临。
Forecasting the weather has been practised for thousands of years. In the 5th century BC, the Greeks sent out forecasts to sailors. They used signs in nature to forecast the weather. But today, meteorologists provide exact forecasts further in advance. They use scientific instruments to study weather conditions around the world and make forecasts. Pilots, farmers and many other people depend on these forecasts. Luckily, most of us can simply check the smartphone or turn on the TV to find out what kind of weather is coming.
预测天气已经被实践过数千年。公元前 5 世纪，希腊人就向航海者发布天气预报。他们利用自然界的迹象来预测天气。但如今，气象学家能够更提前地提供准确的天气预报。他们使用科学仪器研究世界各地的天气状况，并进行预报。飞行员、农民和其他许多人都依赖这些预报。幸运的是，我们大多数人只需查看智能手机或打开电视，就能知道接下来是什么天气。
If you are looking for some signs of the weather, pay attention to nature. There are two basic rules used in weather forecasting: Weather generally moves from west to east, and low air pressure usually means rain or snow. So pay attention to the signs. If rainbows form in the west at sunrise, the sun is on the way. Smell the flowers--their smells are stronger in wet air. What are the ants doing? Are they moving to higher ground? This could mean a drop in air pressure. Are the birds flying low or high? Falling air pressure may influence birds' ears, so they fly low. And if the sky is red at sunset, you might plan a picnic for the next day!
如果你正在寻找一些天气的迹象，请关注大自然。天气预测中有两个基本规律：天气现象一般自西向东移动，低气压通常意味着下雨或下雪。因此，要注意这些迹象。如果日出时西边出现彩虹，那么晴天就在路上了。闻一闻花儿--在潮湿的空气中它们的香味更为浓郁。蚂蚁在做什么？它们是否正往高处移动？这可能意味着气压的下降。鸟儿飞得是低还是高？气压下降可能会影响鸟儿的耳朵，所以它们会飞得低一些。如果日落时天空呈现红色，那么你就可以计划第二天的野餐了！