I was quite surprised when I read in your letter that you had decided not to finish your studies at the university.
当我在你的信中看到你已决定终止大学学业时感到很是惊讶。
It is said that the nerve poison is the more primitive of the two, that the blood poison is, so to speak, a newer product from an improved formula.
据说,神经毒液在两种毒液中是较为原始的一种,而溶血性毒液,打个比方说,是根据改良配方生产的一种较新的产品。