题目内容
a. existing or coming before
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a. happening before a more important action or event
n. a type of job that needs special training or skill, especially one that needs a high level of education
v.to throw sb. /sth. with force; n. an area of ground specially prepared and marked for playing a sports game
vt. to control sth. by means of rules; to control the speed, pressure, temperature, etc. in a machine or system;
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