宇宙恒常説は、宇宙が絶えず膨張しているが新しい物質が連続的に生成され、平均密度が一定であるということを示唆しています。
The steady state theory suggests that the universe is constantly expanding but new matter is continuously created, maintaining a constant average density.
They had lived there until they came to Tokyo.
She's older than Tom.
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