One of the glass panels in the frontdoor was cracked.
前门的一块方玻璃破裂了。
《牛津词典》
2
But as the stand-off wore on, armed police approached the coach and began to smash windows and the glassfrontdoor.
但随着对峙的推移，武装警察靠近旅游车，开始打碎窗户和前门玻璃。
3
Inside the apartment the doors were open, as I could see through the glass of the frontdoor, and I could also make out the mirror, the wardrobe, and the clock in the hall.