海の下のケーブル
Long cables under the ocean carry almost all of the information that travels between countries.
Before you read
Before you read
人が外国にメッセージを送るとき、そのメッセージは海の下を通ります。長いケーブルが海の底にあります。それらは世界中の町と国をつなぎます。
ケーブルはあまり大きくありません。多くは、庭で使うホースくらい細いです。中には、細いガラスの糸があります。それぞれ、髪の毛くらい細いです。光がガラスの中をとても速く進みます。そして、情報を運びます。
これらのケーブルは、大事な仕事をします。国と国の間のメッセージの、百のうち九十五くらいを運びます。今、海には六百本以上のケーブルがあります。全部合わせると、とても長いです。それらは、地球のすべての海を通ります。
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