这副眼镜的耳挂部分可以调节，戴起来更舒服。

The ___earpieces on these glasses are adjustable for a more comfortable fit.

特工通过隐藏的耳塞接收秘密指令。

The agent received secret orders through his hidden ___earpieces.

这副眼镜的耳挂太紧，戴久了耳朵会疼。

The ___earpieces of these glasses are too tight and hurt my ears after long wear.