But many siphons are needed for each lake, so the cost of de-gassing is high.
但是每个湖泊需要很多的虹吸管，因此提取这些气体的费用很高。
The house sits high on a hill overlooking a lake.
房子高高地坐落在可以俯瞰湖水的小山上。
The house sits high on a hill overlooking a lake.
房子高高地坐落在俯瞰一片湖水的小山上。
The house sits high on a hill overlooking a lake.
房子高高地坐落在俯瞰一片湖水的小山上。
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