1 在引语中插入你自己选用的单词时，该单词使用括号。

Incorrect: The professor said that "Frankfurter evolved from liberal to conservative while on the Supreme Court (and) Blackmun evolved from conservative to liberal."

Correct: The professor said that "Frankfurter evolved from liberal to conservative while on the Supreme Court [and] Blackmun evolved from conservative to liberal."

2 为表示你在引语中改变了一个单词的一部分时，该部分使用括号。此类情形通常发生在为合并引语和你自己的句子时，要把大写字母变小写字母，反之亦然。

引语:

"Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted." U.S. Const. amend. VIII.

　　不正确合并:

The Eighth Amendment provides that "Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted." U.S. Const. amend. VIII.

正确合并:

The Eighth Amendment provides that "[e]xcessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted." U.S. Const. amend. VIII.