determine on有決定、確定要做什么的意思； 而decide on 有選定、決定的意思。

They tried to determine the highest speed of the machine through a number of tests.

他們?cè)噲D通過幾個(gè)實(shí)驗(yàn)來確定機(jī)器的最高速度。

He has decided on his career as a vet.

他選定獸醫(yī)為自己的職業(yè)。