立即 (lì jí) means “immediately”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
接到紧急通知后他立即赶往事故现场处理问题。
Jiēdào jǐnjí tōngzhī hòu tā lìjí gǎnwǎng shìgù xiànchǎng chǔlǐ wèntí.
Upon receiving urgent notice, he immediately rushed to the accident site to handle the problem.
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