WebDriverWait.and, or用法

wait.until(ExpectedConditions.and(        
  ExpectedConditions.visibilityOfAllElementsLocatedBy(By.name("Services")),            
  ExpectedConditions.visibilityOfAllElementsLocatedBy(By.name("Products"))
 )
);

wait.until(
              ExpectedConditions.or(
                   ExpectedConditions.visibilityOfAllElementsLocatedBy(By.name("Services")),
                   ExpectedConditions.visibilityOfAllElementsLocatedBy(By.name("Products"))
                   ExpectedConditions.visibilityOfAllElementsLocatedBy(By.name("Contact Us"))
              )
          );