左键 (zuǒjiàn): left button (of a mouse)

Meanings

Shuāngjī zuǒjiàn dǎkāi wénjiàn.

Double-click the left button to open the file.

Ànzhù zuǒjiàn tuōdòng túbiāo.

Hold down the left button to drag the icon.

usage

Pairs with 右键 (right button). For 'click the left button', Chinese says 点左键 or 按左键 rather than just 左键 alone.

左 zuǒ

键 jiàn