Only if the WHEN clause evaluates to true will the action part of trigger statement be executed.
仅当when子句的计算结果为真时，触发器语句的操作部分才会执行。
The while loop, as was the case with the if statement, supports an optional else clause containing a block of program statements executed when the expression is False.
while循环与if语句一样，支持一个可选的else子句，其中包含一个当表达式计算为False时执行的程序语句块。
If the match is successful, the message is received from the mailbox, the message arguments are made available by binding them to the variables in the match, and the corresponding clause is executed.
如果匹配成功，则从邮箱接收消息，消息参数通过绑定到匹配中的变量提供，并执行相应的子句。
TOTAL_SORT_TIME: the total elapsed time (in milliseconds) for all sorts that have been executed by the statement (e.g. query statement using ORDER by clause).
TOTAL_SORT _ TIME：该语句已经执行的所有排序的总消耗时间(微秒级)(例如，使用ORDERBY子句的查询语句)。
The else clause is never executed, so nothing is printed out until you explicitly use a separate print statement.
else子句永远不被执行，所以直到显式使用 print 语句之前不会输出任何东西。
For a while loop, however, this means the code in the else clause is executed once, after the loop is terminated (see the pseudocode shown in Listing 7).
但是对于while循环，这意味着在循环终止后，else子句中的代码被执行一次(参见清单7中的伪代码)。
Executed resolutely fishery law and publicized eneryetically fishery resources aquaculture protecting clause.
强化渔业法和水产资源繁殖保护条例的宣传教育力度；
The Employer shall not terminate the contract under this Sub-Clause in order to execute the Works himself or to arrange for the Works to be executed by another contractor.
雇主不应为了要自己实施或安排另外的承包商实施工程，而根据本款终止合同。
The Employer shall not terminate the contract under this Sub-Clause in order to execute the Works himself or to arrange for the Works to be executed by another contractor.
雇主不应为了要自己实施或安排另外的承包商实施工程，而根据本款终止合同。
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