另外，有條聖羅倫斯河，出河口是加拿大最重要港口之一，甚至可能是北美最重

另外，有條聖羅倫斯河，出河口是加拿大最重要港口之一，甚至可能是北美最重要的港口。

結果 (英文) 1:

In addition, there is a St. Lawrence River, and the mouth of the river is one of the most important ports in Canada, and may even be the most important port in North America.

結果 (英文) 2:

In addition, there is a St. Lawrence River. Its estuary is one of the most important ports in Canada, and may even be the most important port in North America.

結果 (英文) 3:

In addition, there is a saint lawrence river, the outlet of which is one of the most important ports in Canada, and may even be the most important port in North America.