The tunnel would be well-ventilated (9) tall chimneys were built (10) sea level.
只需建造些高出海面的高高的烟囱，该隧道便会通风良好。
The tunnel would be well-ventilated if tall chimneys were built above sea level.
如果再建些伸出海面的高大的烟囱状通风管，隧道就具备了良好的通风条件。
The tunnel would be well-ventilated if tall chimneys were built above sea level.
如果再建些伸出海面的高大的烟囱状通风管，隧道就具备了良好的通风条件。
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