在水下沉了300年，直到40年前被挖掘出来。
It's underwater for three hundred years until they dug it up about forty years ago.
在疏浚工程中，水下被挖掘的土质与水混合后，通常依靠离心泥泵抽吸并输送至排泥场。
In dredging Engineering, The underwater soil, cut and mixed with water, is usually sucked and transported to disposal area by a centrifugal slurry pumps.
绞吸式挖泥船是一种常用的清淤疏浚工具，其核心部件之一是挖掘水下土质的绞刀。
A cutter suction dredger is a kind of dredger commonly used in dredging. One of its key devices is the cutterhead used to cut soils under water.
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