1. Heavy metals from coal mining have contaminated much of the area’s waters.
    开挖煤矿时逸出的重金属已经污染了这个地区的许多水域。

2. Coal and iron are minerals.
    煤和铁都是矿物.

3. One of the largest ships claimed by the mysterious triangle was a 500-foot coal ship that disappeared on March 4, 1918.
    被这神秘三角吞噬的最大的船只之一，是一艘500英尺的运煤船，它于1918年3月4日消失。