lower-case letters

基本解释

This behavior applies also to out-of-vocabulary words if you type them in lower-case letters into your dictionary, such as ipod.
这一行为也适用于词汇表以外的单词，如果将它们以小写字母的形式输入到字典中的话，例如 ipod。
Note: To make sure, that you can find all occurrences of the specified terms, and because these terms are not known by the underlying dictionary, write the terms in all lower-case letters.
注意：要确定您可以找到指定术语的所有匹配项，并且由于这些术语对于底层字典是未知的，需要全部使用小写字母写入术语。
All names are lower-case letters, there are no more than 10 people in a group, and no name is more than 12 characters in length.
所有名字都是小字字母，每个圈子不会超过10个人，所有名字都小于或等于12个字符长度。

They would just be letters—and lower-case ones, to boot.
ECONOMIST: Time to start giving extrasolar planets proper names