hazardous adj.有危险的；冒险的；碰运气的
The journey to the palace was hazardous. 去往宫殿的旅程是危险的。
heighten v.提高；加强；升高；变强
If you want to succeed, you must heighten your confidence. 如果你想成功，你必须更加自信。
hoist v.升起；吊起 n.起重机，升起，吊起
Do you believe that an adult elephant can hoist the weight of a ton? 你相信一头成年象能提起一吨的重量吗？
hospitality n.好客；殷勤
People tend to refer to hospitality industry as "window" industry just as they call tourism "smokeless" industry. 人们倾向于把服务业比作“窗口”产业，就像他们称旅游业为“无烟”行业一样。
humane adj.仁慈的，人道的，高尚的
She works for humane treatment of prisoners. 她工作于人道对待囚犯的团体。
hurl v.猛投；猛掷，愤慨的说出 n.用力的投掷
He hurled curses at the man who had hurled a stone at his window. 他对向他的窗户扔石头的男人抛出狠话。
hypothesis n.假设
The researcher made three hypotheses before his experiment, but only proved one. 研究者在实验之前做了三个假设，但只证实了一个。
ignite v.点火；燃烧
He approached the explosive to ignite it. 他走近炸药点燃它。
illiterate adj.文盲的 n.文盲
About half the population in the country is still illiterate. 这个国家超过一半的人口还是文盲。