U has a short sound in 'cup' and a long one in 'blue'.

U在'cup'中发短音，在'blue'中发长音。

同一单元的其他句子

• The letter A sounds like a long vowel in the word cake.字母A在单词cake中听起来像长元音。
• Can you hear the difference between the letters B and P?你能听出字母B和P之间的区别吗？
• Please practice the sound of the letter C in the word cat.请练习字母C在单词cat中的发音。
• The letter D is pronounced with a quick tap of the tongue.字母D的发音需要舌头快速轻拍。
• Do not forget to say the letter E clearly at the end of the word.不要忘记在单词末尾清晰地发出字母E的音。