求翻译：今天在汽机车间主要学习了低压缸和排汽缸的结构。低压缸本机组具有两个低压缸。低压外缸全部由钢板焊接而成，为了减少温度梯度设计成3层缸。由外缸、1号内缸、2号内缸组成，减少了整个缸的绝对膨胀量。汽缸上、下两半各由3部分组成：调端排汽部分、电端排汽部分和中部。各部分之间通过垂直法兰面由螺栓作永久性连接而成为一个整体，可以整体起吊。是什么意思？

Turbine workshop to learn the structure of the low-pressure cylinder and exhaust cylinder. The unit has two low-pressure cylinder in low-pressure cylinder. Low-pressure outer cylinder are all made from sheet steel, designed three-layer cylinder in order to reduce the temperature gradient. From the o

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Today turbine workshop learning structure of the low pressure cylinder and exhaust hood. The low pressure cylinder unit with two low pressure cylinders. All low pressure outer casing consists of steel plates welded together, in order to reduce the temperature gradient are designed 3-layer cylinder.

Today mainly has studied the low pressure cylinder and the row of cylinder structure in the steam engine workshop.Low pressure cylinder this unit has two low pressure cylinders.Outside the low pressure the cylinder becomes completely by the steel plate welding, in order to reduce the gradient of tem