1.unload的基本意思是从车、船、飞机等运输工具上卸下货物或“(使…)下车〔船,飞机〕”。引申可指“摆脱困难”“解除负担”。
2.unload既可用作及物动词,也可用作不及物动词。用作及物动词时,可接表示车、船、货物、乘客等名词或代词作宾语,也可用于抽象事物。

unload from(v.+prep.)
从…卸下… move sth from somewhere
▲unload sth from sth
We began to unload the bricks from the car.我们开始从车上卸下砖块。
They unloaded books from a car.他们从车上把书卸下来。
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unload on〔onto〕(v.+prep.)
▲unload sb/sth on〔onto〕 sb/sth
1.向…倾吐〔吐露〕 give the weight and worry of sth bad to sb else
You can always unload your troubles on the priest, he's there to listen.你可以随时把自己的烦恼向牧师倾诉,他会在那儿聆听。
She began to unload her troubles on her mother.她开始把她的烦恼告诉母亲。
Her husband often unloaded his anger on(to) her.她丈夫经常拿她出气。
2.把负担推给… remove the burden onto; get rid of sth onto
Do you mind if I unload the children onto you this afternoon?今天下午让你给我带孩子,你不介意吧?
They want to unload the stocks on the market.他们想把股票在市场上抛售掉。