So putting my hand in through the open window, I drew the curtain over it, leaving only an opening through which I could take observations;

于是把手缩回开着的窗子、将窗帘拉拢，只剩下一条便于观察的开口。

youdao

Scanning through my Bathroom dossier, it occurs to me that while I've incorporated hundreds of observations from the road into my books, I've used very few from this file.

WSJ: Jeffery Deaver on Bathrooms Around the World | Traveler's Tale