想了很久还是想不通,
想了很久还是想不通,
The HSTpump controls the delivery,depending on the pressure of the driving line,in the respective ranges in which the pressure is lower and higher than the capacity control pressure of HST motor 1.
HST泵根据泵内传输管道的压力（高于或低于HST内1号发动机能够承载的控制压的不同压力范围）来控制传输过程.
详细分析一下~
The HST pump controls the delivery
HST控制传输
depending on the pressure of the driving line
根据传输管道的压力
（这两个分句我们可以用which把它们连接起来）
The HST pump controls the delivery which is depending on the pressure of the driving line.
（翻译显而易见）HST泵根据泵内传输管道的压力来控制传输过程.
（到这里还是很好理解,难点在后面.）
in the respective ranges in which the pressure is lower and higher than the capacity control pressure of HST motor 1.
（我们把这个长句分成N个短语词组)
in the respective ranges 在不同的（压力）范围
in which the pressure is lower and higher than 压力高于或低于（……）
(同样我们把这两个句子用that连在一起)
in the respective ranges that the pressure is lower and higher than
在压力高于或低于……的不同压力范围
the capacity control pressure of 能够承载的控制压（---这里很重要,我们要把它看成一个带定语的名词词组）
(再把这两个带有比较关系的分句连在一起)
in the respective ranges in which the pressure is lower and higher than the capacity control pressure
在高于或低于（它）能够承受的控制压的不同压力范围
HST motor 1 HST的一号发动机
（最后把“它”用这个短句替换）
in the respective ranges in which the pressure is lower and higher than the capacity control pressure of HST motor 1
在高于或低于HST一号发动机所能承受的控制压的不同压力范围
其实后面这个长长的句子是修饰前面的pressure的.为了使它成为一个句子,我们可以用括号把它引在pressure（压力）的后面.于是：
The HSTpump controls the delivery,depending on the pressure of the driving line,in the respective ranges in which the pressure is lower and higher than the capacity control pressure of HST motor 1.
HST泵根据泵内传输管道的压力（高于或低于HST内1号发动机能够承载的控制压的不同压力范围）来控制传输过程.
我讲的条理有些乱,但我已经尽力了.希望你能看得懂= =