secret
Example Sentences
便衣警察在暗中观察嫌疑人的一举一动，寻找进一步破案的关键线索。
biàn yī jǐng chá zài àn zhōng guān chá xián yí rén de yī jǔ yī dòng, xún zhǎo jìn yí bù pò àn de guān jiàn xiàn suǒ.
Plainclothes police officers secretly observe the suspect's every move, looking for key clues to further solve the case.
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