定义
valid: 有效的，有法律效力的
- "This is not a valid form of identification!"
- "Scientists initially thought that the result was an anomaly, and feared their data was tainted, however repeated testing confirmed that the data was in fact valid."
- "It reveals a candidate's true personality: how they relate to other people, their working style and, more importantly, whether or not they think that a horse is a valid form of transportation."
- "Your feelings are valid."
