(1) Note: Open port pressure must exceed closed port pressure.

(2) He glanced at the open port - hole.

(3) Do we want to hide this local open port?

(4) Note: Open Port pressure must exceed closed port pressure.

(5) After a couple of treaties , Shanghai was forced to become an open port colonialists.

(6) He whispered, his arms folded on the side of my bed - place, staring through the open port.