Phthanite
燧石, 角石, 英石岩
🗣️ 情景例句
This weekend I'm going to install a home security system.
这个周末我要装一套家庭保安系统。
He is supposed to be there on time.
按理说他应该准时到那儿。
You really have an ear for pop music.
你确实对流行音乐很有欣赏力。