IFTB的相关资料：
临近单词
IFP
if
If you're walking home alone.
IfI hadn't missed the chance.
If you need boarding arrangement
IF ... THEN ... ELSE
if the need/opportunity arises
If why treat irregular space?
If the pneumonia outbreak worsens
if he meets their requirements.
IF induction heating power supply
IFN-stimulated response element
