进出口

They are engaged in import and export.

他们做口贸易。

Are drayage trucks required to enter and exit through a designated entrance and exit?

货车是从指定口入吗?

Through the HuangPu Customhouse verifies and authorizes, we have qualification to do the Import and Export for Inspection and clearance of goods .

经黄埔海关审核批准，具备代理口货物报关报检资格。

Well equipped, these instruments feature: multiple entrance and exit ports, high precision wavelength drives, extended range operation, Echelle, and oversize grating mounting capabilities.

这些精良备特点是：多重口，高精度波长驱动，可拓展操作范围，阶梯光栅，大光栅挂。