first operand

基本解释

Next, click the first operand?, then choose Select an event.
下一步，单击第一个 operand? ，然后选择 Select an event。
Any high-order bits that are not within the range of the type of the first operand after the shift are discarded, and the low-order empty bits are zero-filled.
不在移位后第一个操作数类型范围内的任意高序位均不会使用，低序空位用零填充。
In the Second operand field, you can either select the input for the block (a reference that contains a string value to be compared with the First operand), or you can type in a value.
在 Second operand 域，您既可以为块（一个包含与 First 运算域比较的字符串值的引用）选择输入，也可以键入一个值。