first operand

基本解释

Next, click the first operand?, then choose Select an event.
下一步，單擊第一個 operand? ，然後選擇 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.
不在移位後第一個操作數類型範圍內的任意高序位均不會使用，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，您既可以爲塊（一個包含與 First 運算域比較的字符串值的引用）選擇輸入，也可以鍵入一個值。