diffusion
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インターネットの普及で生活は大きく変わった。
The spread of the internet has greatly changed daily life.
この技術の普及にはまだ時間がかかりそうだ。
It seems it will still take time for this technology to spread.
電気自動車の普及を後押しする政策が必要だ。
Policies are needed to support the spread of electric vehicles.