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Sirens are an inescapable part of modern life. While steam-powered sirens existed earlier for industrial use, the modern siren’s creation is often __1__ Scottish inventor John Robinson around 1799. His invention, which used air currents and spinning discs to create sounds, was initially intended for musical purposes. It wasn’t until 1891 that the practical application of these distinctive sounds became evident, leading to their development for use underwater.
The books in this section are intended for young readers.
此區的書籍是專供年輕讀者閱讀的。
We should alert everyone to the dangers of smoking.
我們應該提醒每個人警覺抽菸的危險。
You can make a world of difference to a child by giving them words of encouragement.
多鼓勵孩子就能使其大有不同。