Jenniskens estimated that the explosion took place 23 miles up-the number that best agreed with Chesley's track-and then worked out where along the line the surviving fragments would fall.

根据切斯利提供的数据，杰尼斯肯斯估测爆炸将发生在23英里高空，然后他计算出幸存碎片将坠落的位置。

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The explosion occurred on Botnia’s transfer line for weak malodorous gases when the mill was started up after a 48-hour maintenance shutdown.

此次爆炸发生在这家博特尼亚工厂的低压恶臭气体传输管线上，当时正值该纸浆厂经过48小时保养停产之后的重新启动。

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Explosion on railway line is the basis of the reflection of its cause, process and result.

铁路线路爆炸是反映铁路线路爆炸发生原因、过程和结果的物质基础。

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Nicholas Yanni of Boston was with his wife and friends watching another friend cross the finish line when the explosion occurred.

WSJ: Once-doubted tourniquet seen as Boston lifesaver

He had crossed the finish line shortly before the explosion and was 120 yards away when it went off.

NPR: Loved Ones Seek Word On Boston Runners After Blast

Aaron Hern, an 11-year-old from California, was getting ready to cheer his mother Monday as she neared the finish line when the first explosion struck.

WSJ: The Faces of Tragedy