New words：

seldom [ˈseldəm] adv.很少；难得；不常

seldom在句中的位置通常是紧靠动词，放在实义动词之前，特殊动词（如be动词、情态动词、助动词）之后。

Sample Sentences：

Barking dogs seldom bite.
My cat is seldom noisy at night.​​
This baby seldom cries unless he is tired.
It is seldom that we have a picnic in winter.​​

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