Life moves pretty fast. If you don't stop and look around once in a while, you could miss it.

语音讲解：
单词发音
while /waɪl/
miss /mɪs/
词间连读
once in a while /wʌnsɪnəwaɪl/
you could miss it /jukəmɪsɪt/

词汇讲解：
1.once in a while phrase.
now and then 时而,不时
e.g.He went to see his grandmother every now and then.
他时而去看看他的祖母.
now and again 时而
e.g.He chops in now and again.
他不时插一两句话.
once in a while 偶尔,有时
e.g.He comes to see me once in a while.
他现在是偶尔来看看我.
2.miss
1)."miss"有想念的意思，指因为某物或某人不在了，或者在离你很远的地方，因而想念。在这种情况下，不要使用进行时ing形式。
I miss the carefree days of my youth.
2)."miss"的另一种意思稍有不同，指你找不到某样东西了。在这种情况下，使用ing形式就很常见了。
This puzzle is missing a few pieces.
The police are looking for a missing child.(在这个句子中，“missing”是形容词。)
3)"miss"的第三种意思是说，你试图击打或者投掷某物但没有命中，也就是“未击中/未投中”的意思。
That guy is a terrible basketball player. He always misses the basket.
The forward missed the goal.
4)"miss"的第四种意思是说，约定好了一次见面、一场会议或者某种服务，但你没能赶上或者你没去。
Try not to miss any more classes.
I'm sorry I missed the party. Was it fun?
5)"miss"还有一种用法很重要，和动词用法完全不同，用作未婚女性的称谓。
未婚：Miss
已婚：Mrs.
不确定：Ms.
Our teacher is Miss Rickenbacker.(她没结婚，还是单身。)
The principal’s name is Mrs. Fender.(她已婚。)
Ms. Gibson is a lawyer.(我们不清楚她是否已婚。职业女性通常使用“Ms.”。)

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