每日积累“背三句”- “对比”表达
Although factory farming may be more profitable, there are major doubts about it’s morality.
讲解：
although后边不加but，一定要记住！！！
factory farming 工业化养殖;工厂化饲养
may be ... 可能是...
profitable 有利可图的，赚钱的
major doubts 很大的疑虑
morality 道德性
While the car may be the most popular form of transport, it also causes the most pollution.
讲解:
while 虽然，即使（放在句首）
the car 汽车（统称，the+n可以表示一类事物）
form of transport 交通方式
cause 引起，导致
No matter how harmful it is to the environment, mass tourism should still be encouraged.
讲解:
no matter how ... 无论多么...
harmful 有害的 be harmful to ... 对...有害
mass tourism 大众旅行
be encouraged 被鼓励