it's not difficult to understand
理解するのは難しくない (rikai suru no wa muzukashikunai)
"You can learn to cook, it's not rocket science."
"料理を学ぶことができる、理解するのは難しくない。" (ryouri wo manabu koto ga dekiru, **rikai suru no wa muzukashikunai**.)
to perform or express emotions through actions
in written form; clearly stated
To keep someone informed about something.
to subtly insult or criticize someone
a peaceful time before trouble begins
to fail to meet expectations or standards
