因素 (yīn sù): yếu tố

We lost the match this time; the main factors were player injuries and insufficient training.

Many factors determine housing prices: besides location, there are also transportation and educational resources.

The doctor said I'm recovering slowly; age is one factor, but lack of rest is also a reason.

When considering whether to study abroad, the economic factor is often the most important.

Success doesn't rely only on hard work; luck is also a factor that cannot be ignored.