你好。以下两种都是正确的但更普遍的是 2 ：
1 This river has the same length as that one.(有着)
2 This river is the same length as that one.（是）
也可以是：
The two rivers are the same in length.
The two rivers are (of) the same length
The two rivers are of a length
我肯定是is
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