No. is the written short form of number. You put it before a figure when you are naming which one in a list: house no. 12, room no. 3, symphony no. 40.

No. is the written short form of number.No.是number的書寫簡寫。 when you are naming which one in a list當你在說明是清單裡的哪一個時 You put it before a figure你會把它放在數字前面 house no. 12, room no. 3, symphony no. 40像是「12號房子、3號房間、第40號交響曲」

In speech you usually say “number”, not “no”.

In speech在口語裡 you usually say “number”你通常會說「number」 not “no”而不是「no」

You will see it on doors, on forms, and in the titles of pieces of music, as in Mozart’s piano concerto no. 21.

You will see it你會看到它 on doors在門上 on forms在表格上 and以及 in the titles of pieces of music在樂曲的標題裡 as in Mozart’s piano concerto no. 21像是莫札特的第21號鋼琴協奏曲

Though actually, American writing often uses the hash sign (#) for the same job, while British and older formal writing like No.

Though actually不過實際上 American writing美式書寫 often uses the hash sign (#)常常使用井字號（#） for the same job做同樣的用途 while而 British and older formal writing英式和較舊式的正式寫法 like No.偏好用No.

It is not the word no that answers a yes/no question — it only looks like it. The little full stop is a clue that it is a short form.

It is not它不是 that answers a yes/no question用來回答yes/no問題的 the word no「no」這個字 it only looks like it它只是看起來很像 The little full stop那個小小的句點 is a clue是一個線索 that it is a short form顯示這是個縮寫