单词释义：根据英语解释写出相对应的单词或短语。 1. something that happens, especially something important, interesting or unusual ______ 2. a water way dug out of the ground to connect two areas of water ______ 3. gas that hot water gives out ______ 4. all the people in a country ______ 5. many; a lot of ______ 6. a sudden event such as a flood, storm, or accident that causes great damage or suffering ______ 7. to put somebody or something under the earth, often in order to hide him or it ______ 8. to save someone or something from a situation of danger or harm ______ 9. a special wall built across a river to stop the water from flowing ______ 10. someone who works underground in a mine ______