Relief valve or vent valves permit a small pressure to be maintained on the vapor over the oil in the tank (except when the tank is being emptied).
卸压阀或通气阀使罐内油面上方的蒸汽保持微正压(油罐正在排空时除外)。
Tanker tonnage identified, conception of engine horsepower size, best matched with tank tonnage, carrying big, small engine, oil transport vehicle back force.
罐车吨位确定了，就要构思发动机的马力大小，最好跟油罐吨位匹配了，承载大了，发动机小，油品运输车辆背力。
The oil leaked away because there was a small hole in the tank.
油渗出来了，因为油箱上有个小洞。
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