lit. not following the straight path (idiom); fig. looking for a shortcut to get ahead in work or study

recommend oneself to a post

be obstructed by conditions and prohibited by circumstances

the pleasure of giving birth to a boy

be scattered here and there

Habit makes things natural.

Intensive training

make a thoroughgoing change

failing to see anything wrong in what one is used to

mobilize all military forces for a war

bark up the wrong tree(chase shadows)

be beautiful enough to feast the eyes

Beautiful appearance

be anxious to see your appearance and bearing(wish to see your pleasant face)

cut off a large section of the crane's legs and join the parts to the wild duck's legs

a blown off kite

rend the welkin(resound across the heavens)

Usages arise from common practice.

find fault with(pick a hole in)

make a sophisticated speech(mouth fair/fine words)