variable-block

例句：

1. 1. The software is designed to be easily modifiable and expandable.
   该软件设计为易于修改和扩展。
2. 2.In the design of the circuit, we need to consider the impact of temperature on the variable block.
   在电路设计中，我们需要考虑温度对可变块的影响。
3. 3. The variable block in this machine has a high precision and can precisely control the output signal.
   这台机器中的可变块具有高精确度，并能精确控制输出信号。