be null
系表结构，表示状态无效。
The agreement is null because it was signed under duress.
该协议无效，因为是在胁迫下签署的。
不存在的；空的；零值的；中性的；微不足道的；空集的
having no legal or binding force; invalid
无效的；'null and void'
Having no validity; "null and void".
不重要的
Insignificant.
缺席或不存在的
Absent or non-existent.
空集的
Of the null set.
精确为零的值的
Of or comprising a value of precisely zero.
导致基因功能完全丧失的；无定形的
Causing a complete loss of gene function; amorphic.
中性的
Neutral.
The contract was declared null because it lacked proper signatures.
该合同因缺少有效签名而被宣布无效。
用法提示：此处 'null' 作形容词，表示法律上无效。
His vote was considered null due to a procedural error.
由于程序错误，他的选票被视为无效。
用法提示：'null' 作形容词，描述选票无效的状态。
The court ruled that the agreement was null and void.
法院裁定该协议无效。
用法提示：'null' 与 'void' 连用，强调无法律约束力。
系表结构，表示状态无效。
The agreement is null because it was signed under duress.
该协议无效，因为是在胁迫下签署的。
固定短语，常用于法律语境，强调完全无效。
The court declared the contract null and void.
法院宣布合同无效。
用作定语，修饰名词，常见于技术或数学领域。
A null value indicates missing data.
空值表示数据缺失。
动词后接宾语和形容词补足语，表示使某物无效。
The error rendered the entire experiment null.
这个错误使整个实验无效。
grammar · medium
易错句子The court nulled the contract.
正确表达The court declared the contract null.
null 是形容词，表示“无效的”，不能直接用作动词。正确的表达是使用 “declare...null” 结构，意为“宣布……无效”。
grammar · medium
易错句子The test score was null.
正确表达The test score was zero.
表示数值为零时，应使用 “zero”，而非 “null”。“null” 多指法律上的无效或计算机中的空值，不用于数字概念。
void 强调法律上自始完全无效，常与 null 连用；null 更侧重无法律约束力或无价值。
nil 主要用于比分、数值或数量为零，而 null 指抽象的无价值或无效。
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