Pentaether
五醚, 四甘醇二丁醚
🗣️ 情景例句
Do you have any other symptoms? Any more than those you've described?
你有没有其它的症状？除了那些你已叙述过的？
When did you graduste?
你什么时候毕业的？
On the left.
站在左边。