本文主要介绍了油轮单壳改造为双壳的典型结构、焊接顺序、线型光顺、质量控制等方面的主要工艺流程。
This paper introduces the main processes about typical structure, welding sequence, lines fairing and quality control etc. for the conversion from single-hulled tanker to double-hulled tanker.
例如，海星捕食各种双壳类软体动物，防止这些双壳类动物独占海底的栖息地。
For example, sea stars prey on a variety of bivalve mollusks and prevent these bivalves from monopolizing habitats on the sea floor.
通过的这些新标准将对保护人类健康大有帮助，因为它们提出鱼类中铅以及大米、海洋双壳贝类和头足类动物中镉的新的最高限量。
The new standards adopted will go a long way towards protecting human health, as they set out new, maximum limits for lead in fish, cadmium in rice, marine bivalve molluscs and cephalopods.
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