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1961年、ソビエト連邦は西側に先駆けホームドアを実用化。その世界初のホームドアは、ロシアのサンクトペテルブルク地下鉄Парк Победы(勝利公園)駅で今も稼働中だ。メトロ建設に注力したソ連は、工期短縮と建設費の削減を目的にГоризонтальный лифт(ホライズンタル・リフト)と呼ばれる新設計の地下鉄駅を開発した。線路とホームを完全に分離することで、線路用のシールドマシンを再配置することなく駅の設置を可能としたのだ。その工法上の都合が重厚な扉(当初は磨りガラス製)を生み出したのである。しかし結局のところ、運用コストの問題で採用は10駅に留まり、ホームドアが普及することはなかった。ちなみに、ソ連は1950年代から自動運転を開発していたが、ホームドアの設置当時は実用化されておらず、当時の運転士は極めて高い精度のブレーキ操作を要求されていた。手動時代は多少進入速度が抑えられていたとはいえ、ソ連邦の労働者の高度な技量を物語る例だ。
YouTube is one of the largest platforms for sharing videos and music worldwide, offering a vast catalog of content ranging from music videos to live recordings of famous artists. This is where the need to download music from YouTube in formats like MP3 or MP4 comes in. In this article, we will explore how you can do this quickly, easily, and for free using online tools.
There are several reasons why someone might want to download music from YouTube:
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Here are the general steps to download music from YouTube using an online tool:
Remember to respect copyright when downloading and using content from YouTube. It is important to use these tools for personal or non-commercial purposes and not to illegally share or distribute copyrighted content.
Downloading music from YouTube in MP3 or MP4 formats is a convenient way to access your favorite content offline and customize your music experience. With the help of free online tools, this process becomes simple and accessible to anyone. Always remember to respect copyright and use these tools ethically and legally.
Download and convert YouTube videos to MP3 with our fast and easy audio converter. Our service is free and no account is needed.
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