Jin Yihua Across Quotations

This means one bridge in less than 30 km across the nearly 3,000-km-long trunk of the river by that time.

This means one bridge in less than 30 km across the nearly 3, 000-km-long trunk of the river by that time.

This means one bridge in less than 30 kilometers (19 miles) across the nearly 3,000-kilometer-long trunk of the river.