Alkron
对硫磷, 一六○五, 二乙基对硝基苯硫代磷酸酯
🗣️ 情景例句
When can I photograph a class?
我何时才来上课呢？
Knowledge is power.
知识就是力量。
There is only one difference between an old man and a young one:
老年人和年轻人之间仅仅有一个不同：