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2. 时态题:Sound travels through air. 用现在时的原因表客观事实。
3. 翻译:Where there is no air,there is no sound. 没有空气的地方就没有声音。
4. Deadly(adj.)致命的,e.g. deadly rays 致命的射线
5. But our bodies are built in such a way that this weight does not crush us.
6. 翻译:Electrical energy is collected in the atmosphere as water is collected and stored in a dam. 电能被储藏在大气层里就宛若水被汇集并储藏在大坝里一样。
7. But a thorough study of electricity in the atmosphere was not possible until the development of radio and radar. Not…until…直到什么时候…才
8. Large amounts of +不可数名词,表示大量的
9. Unending adj. 无穷无尽的
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