多くの国で

in many countries

→ 多く
phrase Rare #39,289
in many countries 多くの means “many,” 国 means “country,” and で marks the location where something happens. The particle は may be added after で for emphasis or contrast: 多くの国では.
JA: 多くの国で日本語が勉強されています。
EN: Japanese is studied in many countries.

多くの国で喫煙を禁止する法律出来ている

Laws banning smoking have been enacted in many countries.

多くの国で大麻購入もしくは喫煙は法律禁じられている

In many countries, purchasing or smoking cannabis is prohibited by law.

の力多くの国である程度使われてきた

Wind power has also been used to some extent in many countries.

英語は世界中の多くの国で話されている

English is spoken in many countries around the world.