1 | But all other routes in and out are tightly controlled. | |
2 | The company's annual import and export trade volume reached 1 billion US dollars. | |
3 | In order to promote export communication, the company plans to participate in international trade exhibitions. | |
4 | The cellular membrane plays a crucial role in regulating what enters and exits the cell. | |
5 | Coastal cities are often important ports for import and export trade, due to their geographical advantage. |