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turn to(把注意力等)转向
例句：More and more people turn to computer science.
愈来愈多的人从事计算机科学研究。
We are all turning our thoughts to the matter.
我们大家都开始转而考虑这个问题。
2.It closed the country to criminals, the mentally ill, and persons who could not support themselves. Later, others were added to this list.
add to增加, 加强
例句：This lesson adds to the value of the book.
这一课增加了这本书的价值。
Since then, the palace has often been added to, rebuilt and repaired.
从那以后, 那座宫殿不断得到扩建和修缮。
3.A literacy test will bear very lightly, if at all, upon English-speaking immigrants or Germans, Scandinavians and French.
if at all如果有的话
例句：I'm blest if I know! ie I don't know at all.
我要是知道就好了(我一点也不知道).
