Be subject to sth (idiom)

　　●likely to experience or suffer from something.

　　　　（遭受，受…的影響）

　　Examples:　　

　　1.All flights are subject to delay.　　

　　2.If the plants are growing well, they'll be less subject to pests.

　　Spark off (phrasal verb)

　　●To make something happen, especially something involving violence or angry feelings.

　　　　（引發，導致）

　　Examples:　　

　　1.The visit of the G20 leaders sparked off (= caused the start of) mass demonstrations.　　

　　2.The trial sparked off widespread rioting in London.

　　Keep pace (with sb/sth) (idiom)

　　●To develop or progress at the same rate as someone or something else.（跟上，同步）

　　Examples:　　

　　1.The government is not allowing salaries to keep pace with inflation.　　

　　2.She works so fast that I can't keep pace with her.

　　Pick up (phrasal verb)

　　●To increase in speed or amount.（增加，增強）

　　Examples:　　

　　1.Economic growth is expected to pick up next year.The truck picked up speed slowly.　　

　　2.The number of applicants will pick up during the autumn.

　　Trifle with sb/sth (phrasal verb)

　　●To treat someone or something carelessly or without respect.（小看，輕視，怠慢，玩弄）

　　Examples:　　

　　1.Don't talk that way to me! I am not to be trifled with.　　

　　2.He trifled with her affections.