YouTube总部发生枪击案

veganism - n. a philosophy of not eating meat or using animal products

filter - v. use software to prevent someone from looking at or receiving material through the internet

channel - n. a path for particular contents online

opportunity - n. a situation in which something can be done

patio - n. a flat area of ground that is covered with a hard material (such as bricks or concrete), is usually behind a house, and is used for sitting and relaxing