河补充说
River added
以上为机器翻译结果，长、整句建议使用 人工翻译 。
那些有400年岁月痕迹的硬壳表明，当年詹姆斯河的河水盐度更高，也就是说可以补充淡水资源的降雨极其稀少。
The 400-year-old shells show that the James River was saltier back then, which shows that there was little rainfall to recharge the supply of fresh water.
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