How the word "ふうとう（封筒）" is translated into English
書類を封筒に入れました。
大きい封筒はありますか。
この封筒に名前を書いてください。
"ふうとう（封筒）" is in the lesson "Business 1" (Level 33), along with 12 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.
