Grounds for exclusion or deportation include health, conviction of crimes, threats to U-S security, or violations of immigration laws.

• 拒绝入境和驱逐出境需要考虑到的因素有（对公众的）健康卫生、（是否）犯罪、（是否）对美国安全构成威胁、或者（是否）违反了移民法。