翻译下列句子，注意使用词性转换法。1. The rotation of the earth on its own axis causes the change from day to night.2. He used to be a good eater and a good sleeper, but now he is not at all because of great responsibility for his leading position.3. Some knowledge about the structure and history of Chinese characters is helpful for your study of the language.4. The dust, the uproar, and the growing darkness threw everything into chaos.5. After several blocks, he found an empty park bench.6. He's on the phone.7. The soldiers worked long hours everyday on meager food, in cold caves, by dim lamps.

翻译下列句子，注意使用词性转换法。 1. The rotation of the earth on its own axis causes the change from day to night. 2. He used to be a good eater and a good sleeper, but now he is not at all because of great responsibility for his leading position. 3. Some knowledge about the structure and history of Chinese characters is helpful for your study of the language. 4. The dust, the uproar, and the growing darkness threw everything into chaos. 5. After several blocks, he found an empty park bench. 6. He's on the phone. 7. The soldiers worked long hours everyday on meager food, in cold caves, by dim lamps.