دلیل

دلیل

Reason; cause; proof.

Here, 'دلیل' is used as a noun meaning 'reason,' specifying the cause or purpose of success.

دلیل موفقیت او، تلاش بیش از حد بود.

The reason for his success was his excessive effort.

In this sentence, 'به دلیل' is a prepositional phrase meaning 'due to,' indicating the cause or reason for an event.

به دلیل بارندگی زیاد، سفر ما لغو شد.

Due to heavy rainfall, our trip was canceled.

Here, 'دلیل' denotes justification or motive for an action, used in this example to refer to the reason for complaining.

او دلیلی نداشت که اعتراض کند.

He had no reason to object.