条件语句

In modern Chinese, there exists an expanding tendency in the employment of accusative subject sentence, where accusative word is taken as the subject; meanwhile, many meaningful discussions have also been conducted in its types, expressive functions, conditions of usage, and forming reasons.

受事主语句是受事做主语的句子，在现代汉语中的使用有扩大的趋势。很多学者对受事主语句的类型、表意功能、使用条件及形成的原因等都进行过有意义的探讨。

The cond form finds the first clause whose condition evaluates to true (ie, doesn't evaluate to nil); it then executes the corresponding action and returns the resulting value.

cond 分支的第一个元素是条件；其它的元素是动作。cond语句查找第一个条件解析为 true 的分支，执行其响应动作并返回结果值。

Second, we rewrite the simple path expression into SQL statements. We research the different rewriting techniques for the different mapping nodes and different condition in where clause. For the query optimizing, we propose the path index based on the notion of node equivalence which is computed by bi-simulation algorithm.

第二步把简单路径表达式通过DTD字典重写为SQL语句，主要研究了对于SPE上的结点由于其映射的结点类型不同而进行不同的重写处理，同时研究了对于带有条件的查询在各种情况下的重写过程（如返回路径和条件路径不在一条路径上、多条件查询等）。

The optimization methods of database SQL query were studied and some available query optimization Methods were given out as follows: The incompatible data type should avoid to be used; More redundancy search parameters should be given as join condition in join query; In some condition, the number of note hitted to target was estimated by optimizing implement using the average density; Some other maths operating symbol should avoid to be used as condition parameters in WHERE clause; Some operating symbol and its sentence should avoid to be used also; When the cluster function was used,the WHERE clause should be paied attention to more,and so on.

作者单位：（重庆工学院商贸信息学院，重庆 400050）摘要：数据库SQL查询语句的优化，须注意：避免使用不兼容数据类型；连接查询中应多给连接条件提供一些冗余的搜索参数；某种条件下优化器只能使用其平均密度以估计命中的记录数；避免对WHERE子句中条件参数使用其它数学操作符；避免使用某些操作符及相应语句；聚簇函数的使用应注意WHERE子句。

Second, the condition itself is almost always reversed (so that the jump to the 'else' block only takes place when the condition is not satisfied), and the primary conditional block is placed right after the conditional jump (so that the conditional code gets executed if the condition is satisfied).

第二，和单条件分支一样，条件声明与源代码中的条件声明也是相反的(道理同上：这样单条件不满足时就可以直接跳到else语句块中)而第一个跳转直接跟在条件声明之后。

First of all, in two-way conditionals the conditional branch points to the 'else'block and not to the code that follows the conditional statement.

第一，在双条件分支中指向else 语句块的条件分支指针并不是紧跟在条件声明之后的。

Single conditional statement. When specifying more than one condition, the code must specifyhow the multiple conditions are to be combined.

语句中。当判断条件不只一个时，代码就不得不决定怎样把几个判断条件合并在一起。

A two-way conditional is different from a single-branch conditional in the sense that if the condition is not satisfied, the program executes an alternative code block and only then proceeds to the code that follows the 'if-else' statement.

双条件分支与单条件分支的区别在于：当if语句中条件不满足时，双条件分支语句要执行另一个代码块。

We have seen the else statement with other Python constructs such as conditionals and loops.

我们已经看过else语句段配合其他的Python语句，比如条件和循环。

In this for, the expression uses the prefix increment operator, which as we know adds one to the value of val. After executing the expression , the for retests the condition . If the new value of val is still less than or equal to 10, then the for loop body is executed and val is incremented again. Execution continues until the condition fails.

在这个 for 循环中，表达式使用前自增操作符， val 的值加 1，执行完表达式后， for 语句重新测试条件，如果 val 的新值仍小于或等于 10，则执行 for 语句体， val 再次自增，继续执行直到条件不成立。

This brought fixed cost, but it also is meant at the same time use a source to won't make you singlehanded assume a problem.

这带来了一定的成本，但它同时也意味着使用开源不会让你独力承担问题。

He gained a small fortune in real estate.

他在房地产上发了一笔小财。