例句：
I had a sensation of falling, as if in a dream.
我有一种坠落的感觉，像在梦中似的。
I don't feel as if I belong here.
我在这里感觉格格不入。
I felt as if my heart had stopped.
我觉得好像我的心都不跳了。
I ate as if there was no tomorrow.
我狼吞虎咽地吃着。
He suddenly appeared as if by magic.
他突然神奇地出现了。