Dr. Helfand said that scientists today are tracking large space rocks that are potentially hazardous.

赫尔方博士称目前科学家正着手追踪那些能给地球带来潜在威胁的大型太空岩石。

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Base on the simulation experiments, hazardous minor element from coal mining wastes are studied in relation to their forms of occurrences and contents in coal mining rocks.

在静态模拟试验的基础上，研究了有害元素从煤矸石中浸出的浓度与其在煤矸石中的含量和赋存状态的关系。

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The Torrey Canyon is the largest shipwreck in British waters, and as she sits a long way from shore amongst the same hazardous rocks that she ran on to, its not the easiest wreck to get to.

BBC: Torrey Canyon seabed returns to normal after oil spill