if not in actual fact可以翻译为“如果不是事实”。
重点词汇释义
if not
英 [ɪf nɒt]美 [ɪf nɑːt]
要是不;即使不
in actual fact
事实上，其实;准确地说;确切地说
举例：
1.In the first place it is a perennial& if not in actual fact, at least in the greengrocer's shop.
首先，柑橘常年都有&即使不是在树上，至少是在水果店里。
2.If not, take another look at other methods you could try
如果没有，再看看其它可以尝试的方法。
3.It was a warm day, if not exactly hot.
这一天即使算不上热，也是一个暖和的日子。
4.James looks younger than his wife but in actual fact he is five years older.
詹姆斯看起来比他妻子年轻，但实际上他还大五岁。
5.He apologised as soon as he realised what he had done. In actual fact he wrote a nice little note to me
意识到自己的所作所为后他马上就道歉了，而且还给我写了一张温馨的小条儿。
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