那条刚刚汇入的河流是一条他们刚驶过的河流的近亲，而他们之前驶过的河就已经有曼德尔和或者三岔河那么宽了。
The new river that had joined them was a close twin to the one they had been sailing down, and that one alone had almost matched the Mander or the Trident.
上述特征充分说明岔河、茂密河的火山岩属大陆弧构造环境。
Therefore the volcanic rocks in Chahe and Maomihe belong to the continental arc environment.
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