Meaning of yī:
依
to depend on; to comply with or listen to sb
Wǒ tōngcháng huì yīlài péngyǒu de jiànyì.
我通常会依赖朋友的建议。
I usually depend on my friends' advice.
Tā zǒng shì yuànyì yīkào péngyǒu de yìjiàn.
他总是愿意依靠朋友的意见。
He is always willing to rely on his friends' opinions.
according to; in the light of
Wǒmen huì yī jìhuà xíngshì.
我们会依计划行事。
We will act according to the plan.
Wǒmen yīzhào hétóng guīdìng de tiáokuǎn xíngshì.
我们依照合同规定的条款行事。
We act in accordance with the terms stipulated in the contract.