a careful and systematic study of a subject to discover new facts or information about it

研究, 调查

doing something that someone has planned to, often when they find the right time
to perform a helpful or kind act for someone, typically without expecting something in return
the certificate that is given to university or college students upon successful completion of their course

学位, 文凭

used to mean that one can go on or manage without someone or something
used to mean that one benefits from having someone or something present or available to one
to fasten, button, zip, or otherwise secure something, often related to clothing or accessories

扣上, 扎紧

waste such as bottles, papers, etc. that people throw on a sidewalk, park, or other public place

垃圾, 废物

the scattered pieces of waste, remains, or broken objects, often left after destruction or an accident

碎片, 残骸

to move in a twisting or whirling motion, creating a pattern of circular or spiral motion

旋转, 漩涡

to eat something quickly and greedily, often making loud and rapid swallowing sounds

狼吞虎咽, 咽下

the sequence of organisms in an ecosystem where each organism serves as a source of food for the next organism in the chain

食物链, 生态链

a small, hard particle or granule, often referring to seeds, sand, or similar substances

粒子, 颗粒

used in speech to provide emphasis, or to signal a pause in speech while the speaker gathers their thoughts

我是说, 就是说

