put something by
表示储存或保留备用。
I always put some money by for emergencies.
我总是留一些钱以备急用。
经过；过去
附近；在旁；到访；来访；在一边；储存；在近处
Past someone or something; beyond a point.
Along a path which runs past someone or something.
In the vicinity, near.
To or at a place, as a residence or place of business.
Aside, away.
Beyond or past a certain point.
Put some money by for emergencies.
存一些钱以备不时之需。
用法提示：副词 'by' 表示 '备用'，与动词 'put' 搭配，意为存起来留作后用。
He walked by without noticing me.
他走了过去，没有注意到我。
用法提示：副词 'by' 表示 '经过'，描述从旁边经过的动作。
The parade marched by to the cheers of the crowd.
游行队伍在人群的欢呼声中行进。
用法提示：副词 'by' 表示 '经过'，强调队伍从某处通过。
表示储存或保留备用。
I always put some money by for emergencies.
我总是留一些钱以备急用。
表示经过某处。
A car went by just now.
刚才有一辆车经过。
表示短暂停留或顺便拜访。
Can you stop by the store on your way home?
你回家路上能顺便去趟商店吗？
在表示‘经过某点’时，‘past’与‘by’可互换，但‘past’更强调从旁边越过，‘by’较中性。
grammar · medium
易错句子I by the library every day.
正确表达I go by the library every day.
在汉语中表示“经过”时，“by”被误用作动词，但英语中它只能作副词，需要搭配行为动词。
grammar · medium
易错句子I saved by some money.
正确表达I put some money by.
汉语中“积蓄”可用“by”直译，但英语中“by”作“备用”义时，必须与“put”等动词连用，不能单独使用。
by 强调“储备以备后用”，aside 强调“移到一边（常指暂时搁置）”。
by 作副词意为“经过（不停止）”，past 作副词/介词意为“经过（并越过某点）”。
储存备用
She puts by a portion of her salary each month.
她每个月储存一部分工资备用。
储存备用
He laid by some money for emergencies.
他存了一些钱以备急用。
经过
We watched the parade go by.
我们看着游行队伍经过。
经过
A bus passed by without stopping.
一辆公共汽车经过没有停下。
待命；旁观
The troops are standing by for orders.
部队正待命接受命令。
顺道拜访
If you're free, stop by for a chat.
如果你有空，顺道过来聊聊天。
总的来说
By and large, the project was a success.
总的来说，这个项目是成功的。
顺便说一下
By the way, have you seen my keys?
顺便说一下，你看到我的钥匙了吗？
凭记忆
She learned the poem by heart.
她背下了这首诗。
时光流逝
I saw him walk by without noticing me.
我看见他走过，却没有注意到我。
在美好的将来
Set some money by for emergencies.
存些钱以备不时之需。
Dictionary facts from ECDICT, WIKTIONARY.