此脉冲信号还是行计数器的触发信号，间接地控制振镜场扫的正程和逆程。
The horizontal line's counter is also activated by this signal to control galvanometer up and down.
用于换页定界的页的逻辑大体上相同，只是稍稍简单一些，因为不需要行计数器：使用getc库函数逐个读取字符。
The logic used for form-feed-delimited pages is roughly the same, but slightly simpler, as there is no need for a line counter: Read char by char using the getc library function.
<g:each>标记的status属性是个简单的计数器字段（请注意这个值用在下一行的ternary语句中，用来将CSS样式设为even或odd）。
The status attribute in the <g:each> tag is a simple counter field. (Notice this value is used on the next line in a ternary statement that sets the CSS style to either even or odd.)
初始化计数器列表(第4行到第5行)。
如下面的代码段所示，这需要维护一个计数器，以便能够知道什么时候进行提交并写日志记录，这个计数器不考虑导致异常的行。
As shown in the code snippet below, this requires keeping a counter so you know when to commit and write a log record, taking care not to count rows that cause an exception.
问题查询：这些查询只返回超过重要性能计数器阈值的行，例如缓冲池命中率不到90%的行。
Problem queries: These queries return only rows that exceed thresholds for important performance counters, for example, rows with buffer pool hit ratio lower than 90%.
对于计数器，为3行历史数据中最后一行和第一行值的差。
For a counter, the difference in the value between the last and the first history row of the 3 rows.
尽管SAXCountHandler只有39行，但这39行中，仅有12行直接与计数器有关。
Yet SAXCountHandler is 39 lines long and, out of these 39 lines, only a dozen are directly related to the counter.
为每一行数据所创建的索引成为了计数器，因为每当新的一行数据加进来的时候，这个索引是唯一的增量，这也意味着计数器将与字符串数据的总量同步变化。
The index created for each row of data becomes the count because it was only incremented when a new row of data was found, meaning it is in sync with the amount of data in the string.
为每一行数据所创建的索引成为了计数器，因为每当新的一行数据加进来的时候，这个索引是唯一的增量，这也意味着计数器将与字符串数据的总量同步变化。
The index created for each row of data becomes the count because it was only incremented when a new row of data was found, meaning it is in sync with the amount of data in the string.
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