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
to do something in order to replace something lost or fix something damaged
弥补, 修复
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
to flood or cover something with water, making it hard to use or move through
淹没, 淹】れ
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
used to draw attention to a point or to emphasize a statement or explanation
你看, 你明白吗
used to summarize or draw a conclusion based on previous information or to provide a logical inference
所以, 因此