1
at the bottom of sth
表示位置在物体最下方。
The keys are at the bottom of my bag.
钥匙在我包底部。
底部；最下部
先理解核心含义，再看它在真实句子里的用法。
底部；最下部
the lowest part of something, or its lower surface
The keys are at the bottom of my bag.
钥匙在我包底部。
任何事物的最低部分
The lowest part of anything.
底部
the lower side of anything
某物的最远或最深处
The remotest or innermost part of something.
最下部
the lowest part of anything
The keys fell to the bottom of the bag.
钥匙掉到了包底。
AI contextual example
She slipped on the ice and landed on her bottom.
她在冰上滑倒了，一屁股坐在地上。
AI contextual example
The shipwreck lies at the bottom of the sea.
沉船位于海底。
AI contextual example
they started at the bottom of the hill
他们从山脚下出发
WordNet
表示位置在物体最下方。
The keys are at the bottom of my bag.
钥匙在我包底部。
常指从最低级别或起点开始。
She worked her way up from the bottom.
她从最底层一步步升上来。
表示某物的底部或最低部分。
They reached the bottom of the mountain.
他们到达了山脚。
Not this
The key is in the bottom of the box.
Use this
The key is at the bottom of the box.
中文学习者常误用介词 'in' 来表达 '在...底部'，但 'bottom' 指一个点或面，应用 'at' 表示位置。
Not this
He slipped and landed on bottom.
Use this
He slipped and landed on his bottom.
中文中 '臀部' 可直接说 '屁股'，但英语 'bottom' 作为臀部时需带所有格或冠词，不能裸用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
在底部
The keys are at the bottom of my bag.
钥匙在我的包底部。
底线；最重要的事
The bottom line is that we need to increase sales.
最重要的事情是我们需要增加销售额。
发自内心
I thank you from the bottom of my heart.
我发自内心地感谢你。
触底
The stock market hit bottom last year.
股市去年触底了。
最底层（指质量差或剩余）
That candidate is truly the bottom of the barrel.
那个候选人真的是最差的。
触底（物理或比喻）
After months of losses, the company finally touched bottom.
经过数月的亏损，公司终于触底了。
最低点，低谷
After losing his job, his confidence hit rock bottom.
失业后，他的自信心跌到了谷底。
底线；关键点
The bottom line is that we need to cut costs to survive.
关键是我们需要削减成本才能生存。
发自内心地
I thank you from the bottom of my heart for your support.
我发自内心地感谢你的支持。
我们正式跌到了谷底。
The bottom of the mountain is covered in snow.
山脚下覆盖着雪。
Use bottom naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把bottom联想成屁股坐在底部，因为屁股（butt）是身体的最底部。
作为名词，bottom 多用于描述物理位置（底部）、人体部位（臀部）或水域底部（水底）。'底部'用法较为中性，适用于正式和非正式场合；'臀部'在口语中常见，但正式场合可能被认为不雅；'水底'多用于地理或户外语境。建议根据实际情景选择。
常与定冠词 the 连用，表示最底部
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.