Polyacetylenes
多炔
🗣️ 情景例句
How many people are there in your family?
你家里有几口人？
He informed them that his mother had died.
他通知他们的母亲死了。
On the B.B.C. you can hear the clock when it is actually striking because microphones are connected to the clock tower.
当大钟打点的时候，你可以从英国广播公司的广播中听到，因为钟塔上接了麦克风。