当使用动态字符串串联根据用户输入生成连接字符串时，可能发生连接字符串注入式攻击。
A connection string injection attack can occur when dynamic string concatenation is used to build connection strings that are based on user input.
液压油缸可单独使用，也可串联使用，它一端与机动式换向阀连接，另一端与抽油杆柱连接。
The hydraulic cylinder can be used alone or connected in series. One end of the hydraulic cylinder connects to the motor driven change valve, the other end connects to the rod string.
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