30 is [predicate]
作为基数名词，30被视为单数，谓语动词用单数形式。
30 is an even number.
30是一个偶数。
十和三的乘积的基数
the cardinal number 30
十和三的乘积的基数
the cardinal number that is the product of ten and three
The number 30 appears on the back of his jersey.
数字30出现在他的球衣背面。
用法提示：句中的30作名词，指数字三十。
She circled 30 on the calendar to mark the deadline.
她在日历上圈出了30，以标记截止日期。
用法提示：句中的30作名词，表示日历上的一个日期数字。
He counted to 30 before starting the race.
他开始赛跑前数到了30。
用法提示：句中的30作名词，表示数到的数字三十。
作为基数名词，30被视为单数，谓语动词用单数形式。
30 is an even number.
30是一个偶数。
表示年龄时，30前不加冠词，且turn后直接跟数字。
She turned 30 last week.
她上周满30岁了。
The child can count to 30.
这个孩子能数到30。
grammar · medium
易错句子I am thrity years old.
正确表达I am thirty years old.
拼写错误：'thirty'的正确拼写是't-h-i-r-t-y'，不是'thrity'。
grammar · medium
易错句子I have thirty of apples.
正确表达I have thirty apples.
数量词用法错误：当数字直接修饰可数名词时，不需要加'of'。例如，'thirty apples'是正确的，而'thirty of apples'是错误的结构。
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