既然第一年之后，大家就都知道该凝胶有疗效，那为什么这项试验还不停下来？
If it was known after the first year that the gel was working, why wasn't the trial stopped?
既然第一条评论似乎在强调万事皆相对且其他关注的是卫生问题，二者都平安无事地发表在网上。
Since the first remark seems to emphasize that everything is relative and the other appears to focus on matters of hygiene, both were posted on the Internet without incident.
既然你听起来有点不确定，我建议你第一学期数学和英语两门课都上，看看哪个你更喜欢。
Since you sound a bit unsure, I'd suggest taking bout math and English classes your first semester to see which you enjoy more.
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