您要查找的是不是：
- The chemical symbol for copper is "Cu". 铜的化学符号是Cu。
- The state or quality of being null. 无效无效的状况或性质
- On maps, a cross is the symbol for a church. 在地图上，十字符号代表教堂。
- Cypress branches used as a symbol of mourning. 柏枝作为悲哀象征的柏树枝
- We use x as the symbol for an unknown quantity. 我们用x表示一个未知数。
- The act of making null and void. 废除使 ... 作废和无效
- The white bird is a symbol of freedom. 这白色的鸟是自由的象徵。
- The Cross is the symbol of Christianity. 十字架是基督教的象征。
- The lion is the symbol of courage. 狮子是勇武的象徵。
- The dove is the symbol of peace. 鸽子是和平的象征。
- A mark or symbol used in a writing system. 符号，字体文字系统里的符号或标记
- The contract was null and void because it was not signed. 这个合同无效，因为它尚未签字。
- The symbol for the speed of light in a vacuum. 表示真空中光速的物理符号
- The court ruled that the claim was null and void. 法庭裁决此项要求无效。
- null symbol 空符号
- The symbol for the Roman numeral one hundred. 罗马数字中表示一百的符号
- The marriage was declared null and void. 婚姻已宣告无效了。
- He only bought the yacht as a status symbol he hates sailing. 他买游艇只是为了显示身分--其实他根本不喜欢玩游艇。
- The null subset corresponds to the term 1. 空集则对应于常数项1。
- A null reference pointer was passed to the stub. 向占位程序传送了空的索引指针。
