confuse right and wrong

be reluctant to show weakness

be impassable

have extensive knowledge and profound scholarship

not likely to happen in a century(once in a blue moon)

make somebody's blood boil(to make somebody very angry; as black as thunder; bluster oneself into anger

beg to differ

won't listen to reason

half-dead(more dead than alive)

from the saying 'The Eight Immortals cross the sea,each demonstrating their apecial skill'

Speed is precious in war.

step is identical

almost extinct(very precarious like a thread going to break)

find it unbearable to recall(cannot bear to look back)

maintain one's composure

speak for itself

be not difficult(need not be mentioned)

All sorts of feelings well up in one's heart

do not attend to one's proper business (duties)(neglect one's main job)

have no hope of recovery