rings – n. a round band

manually – adv. operated or controlled with the hands or by a person

intentionally – adv. done on purpose

contamination – n. making something dangerous, dirty, or impure by adding something harmful or undesirable to it

probe – n. a device that is used to obtain information from outer space and send it back to Earth

friction – n. the force that causes a moving object to slow down when it is touching another object

data – n. facts or information used usually to calculate, analyze, or plan something

blaze – v. to move very quickly

curiosity – n. the desire to learn or know more about something or someone

microbial – adj. so small it can only be seen with a microscope


 2/4   首页 上一页 1 2 3 4 下一页 尾页