工厂的烟囱向空气中排放着浓重的黑烟。

The factory ___chimney released thick black smoke into the air.

在一些地区，家庭烟囱排放的烟雾是冬季空气污染的主要来源。

Smoke from domestic ___chimneys is a major source of winter air pollution in some areas.

传统上说，圣诞老人会在平安夜从烟囱下来。

Santa Claus is traditionally said to come down the ___chimney on Christmas Eve.