Polybutylene
[机] 聚丁烯
🗣️ 情景例句
How has your visit to Shanghai been so far?
目前你对上海的印象如何？有何收获？
A match will set fire to a large building.
星星之火，可以燎原。
because balloons can be a great danger to aircraft.
因为气球有可能给飞机造成极大的危险。