VOA慢速英语:尼日利亚大学无视博科圣地威胁 坚持开学

commissioner - n. an official who is in charge of a government department or part of a government department

degree - n. an official document and title that is given to someone who has successfully completed a series of classes at a college or university

focus - v. to direct your attention or effort at something specific

motorcycle - n. a vehicle with two wheels that is powered by a motor and that can carry one or two people

positive - n. thinking about the good qualities of someone or something

reflect - v. to cause people to think of someone or something in a specified way

relax - v. to become or to cause (something) to become less tense, tight, or stiff

resilient - adj. able to become strong, healthy, or successful again after something bad happens

sinful - adj. wrong according to religious or moral law

survey - n. an act of measuring and examining an area of land

trench - n. a long, narrow hole that is dug in the ground