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.
On a clear day, a pilot in controlled airspace can choose a VFR or IFR flight plan, and the FAA regulations were devised in a way which accommodates both VFR and IFR operations in the same airspace.
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14. 我们十分企盼星期六是个晴天。
We're praying for good weather on Saturday.
《牛津词典》
15. 她被解雇简直就是晴天霹雳。
Her dismissal came as a bolt from the blue.
《牛津词典》
16. 那是9月的一个晴天，刮着强劲的东风。
It was a beautiful September day, with stiff easterly winds.
《柯林斯英汉双解大词典》
17. 那消息犹如晴天霹雳。
The news came as a big blow.
《牛津词典》
18. 如果他们的薪水或所得税返还不能兑现，那对他们将是一个晴天霹雳。
It will come as a rude shock when their salary or income-tax refund cannot be cashed.
《柯林斯英汉双解大词典》
19. 可能是雨天、多云或晴天。
It might be rainy, cloudy or sunny.
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20. 人们经常在晴天和刮风的日子放风筝。
People often fly kites on sunny and windy days.
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21. 如果明天是晴天，我将和我的朋友去超市购物。
If it is sunny tomorrow, I will go shopping with my friend in the supermarket.
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22. 天气预报说接下来两天是晴天。
The weather report says it will be sunny in the following two days.
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23. 关于成都的茶馆，有这样一句谚语：茶馆比晴天还多。
There is a saying about Chengdu tea houses: You could see more tea houses than sunny days.
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24. 这就解释了为什么雨伞在晴天和雨天一样常见。
That explains why umbrellas are just as common on sunny days as they are on rainy days here.
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25. 赵的学校要求学生晴天时跑步，天气不好时在室内锻炼。
Zhao's school asked students to run on sunny days and exercise indoors if the weather was bad.
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26. 在英国你应该随身带一把伞，即使是晴天。
You should take an umbrella with you in England, even on a sunny day.
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27. 每逢晴天，大多数女性就在阳光下晒太阳，想要让皮肤晒得更黑一点。
Most women spend every sunny day out in the sun trying to get darker skin.
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28. 他说他在雨天看到在晴天却看不出来的东西。
He says he sees things on rainy days as doesn't show when it's fair weather.
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29. 这是晴天霹雳。
This was a thunderbolt out of a clear sky.
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30. 这消息犹如晴天霹雳。
The news was like a thunderbolt out of a clear sky.
