Alas , experience is a " lantern on the stern , which shines only on the waves behind us " .

唉，经验就是“一盏船尾的灯，它只照耀在我们身后的波涛上”。

Splitting water is one way to solve the basic problem of solar energy : it 's only available when the sun shines .

解裂水解决了利用太阳能的一个基本问题：它仅当太阳照耀时可用。

Air conditioning could be combined with solar power which has one obvious advantage , says maidment . " When the sun shines , you need air conditioning . "

空调可以结合太阳能-这至少有一个优点，梅德门特说“当阳光照耀时，你需要空调。”

It shines in the constellation of canis major and is visible from most everywhere in the northern hemisphere during the winter months . In the southern hemisphere , sirius is visible from all locations during their summer , north of the antarctic circle .

它在大犬星座内照耀，北半球在冬季的月份里，到处都可以看到它，而在南半球，在夏季南极圈以北的所有位置也能看到它。

The ring dust is very cold minus 193c but it shines with thermal radiation .

光环中的尘埃非常冷摄氏零下193度但它因为热辐射而发光。