phew
/fju:; fju/ (also whew) interj (written representation of a short soft whistling sound made by blowing out or sucking in one's breath, and used to express relief, exhaustion or amazement 呼气或吸气发出的很短的口哨声, 用以表示松口气、 疲劳或惊奇)
Phew! That was a nasty moment -- that car nearly hit us. （发出口哨声）当时可真危险--那辆汽车差点撞上我们.