Ethylethylene
丁烯-1
🗣️ 情景例句
We are very pleased with our presend arrangements for printing and definitely will not be considering any other services in the foreseeable future.
在今后的一段时间内我们不会考虑其他的服务提供者。
When is the most convenient time for you?
你在什么时间最方便呢？
What's that?
那是什么？