manual flow control造句

ideal for applications where the valve is not readily accessible, these actuators provide a labor-saving alternative to manual flow control regulation
特别适用于不容易操作阀门的环境，这些执行机构能够替代人工流体控制调节，节省人工成本。
It's difficult to find manual flow control in a sentence. 用manual flow control造句挺难的