"仅仅13元" in Engpsh can be translated as "just 13 yuan" or "only 13 yuan."

The phrase "just" means "exactly" or "precisely," while "only" means "not more than." Both words can be used to indicate that something is small or pmited in quantity.

For example:

"I only have 13 yuan left in my wallet." (我的钱包里只剩下了13元。)
"Can you buy me a coffee for just 13 yuan?" (你能帮我买一杯咖啡吗，只要13元钱？)

In both examples, "just 13 yuan" and "only 13 yuan" are used to indicate that the speaker is requesting something for a small amount of money.