大家帮我翻译一句话（汉译英）

I think the Yangtze river is about three times as long as the Songhua river.
I think the Yangtze river is about two times longer than the Songhua river.
I think the length of the Yangtze river is about three times of that of the Songhua river.

I think the Yangtze River is approximately three times as long as the Songhua River.
I think the Yangtze River is approximately two times longer than the Songhua River.
I think the Yangtze river is approximately three times the length of the Songhua River.

I think the Yangtze River is about three times as long Songhua River.

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