残余的原油深埋在沙子和沉积物中，它们可能会随时再被冲刷出来。
Residual oil buried in sand or sediment may resurface over time.
一种含微体生物骨骼残余物至少30%的远洋沉积物。
A pelagic sediment containing at least 30 per cent skeletal remains of microorganisms.
测定碎屑矿物沉积后吸收的古剂量是第四纪沉积物热释光测年的关键。测定古剂量的方法有三种，即部分晒退法、残余热释光法和再生热释光法。
Determination of the paleodose absorbed by debris minerals in sediments after deposition is a key course for TL dating of the Quaternary sediments.
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