为了应对发际线后退问题，他开始使用一种特殊的洗发水。

To address his receding ___hairline, he started using a special shampoo.

玻璃桌面上有一条几乎看不见的细纹。

There's an almost invisible ___hairline crack on the glass tabletop.

他的发际线开始后退，这让他有些担忧。

His ___hairline is starting to recede, which worries him a bit.