solely engrossed in one thing; just (one thing, no need to worry about the rest); simply; by all means; please feel free; do not hesitate (to ask for sth)[cedict]
相信
xiāng xìnㄒㄧㄤ ㄒㄧㄣˋ
be convinced (that something is true); believe; to accept sth as true[cedict]