答案可能与它们以幼虫形式随着洋流漂流到新的喷气口的后代有关。
The answer might involve their offspring, which in their larval form drift in the currents to colonize new vents.
喷气口四周的岩浆冷却凝固之后。
这里分布着十几个火山喷气口。
There are more than ten eruptive vents distributed over this area.
我看了这么多的喷气口。
原来这叫喷气口啊。
蒸汽和火山灰从火山喷气口涌出时发出飞机发动机样的（巨大）噪音，人们在数公里之外都能听见。
The “jet-type noise” of gas and ash rushing out of fumaroles was heard several kilometers away.
地震学家们发现小地震越来越多，喷气口(fumarole)开始活动，火山口不断有微小的火山灰和水蒸气喷发出来。
Seismologists registered an ever increasing number of small earthquakes, fumaroles began to vent, and minor eruptions shot ash and steam out of its crater.
或徒步走过阳明山的小径阳明山的火山喷气口是一个非常受大陆游客欢迎的景点，这里景色迷人，观后久久萦绕于心，难以忘怀
Or take a hike throughYangmingshan's many trails. The haunting landscape of steaming fumaroles is apopular spot for mainland tourists.
早期的喷气式发动机进气口狭窄且噪音巨大但是随着前部风扇直径的增大发动机变得越来越安静。
Early jet engines had narrow inlets and were very noisy, but as the diameter of the fans at the front increased, the engines became quieter.
但为了保护喷气发动机免遭海水腐蚀，应该把它安装在飞行器的顶部。这样飞行器在起飞或者降落时溅起的水花不会打到进气口处。
But protect a jet engine against saltwater corrosion and position it high on the craft so the spray doesn't enter the intake during take-off and landing, and it will work fine.
飞机喷气发动机进气口管，直径6.00英寸。
Aircraft jet engines air inlet ducts, up to 6.00 inch diameter.
飞机喷气发动机进气口管，直径6.00英寸。
Aircraft jet engines air inlet ducts, up to 6.00 inch diameter.
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