detecting

易错句子She is very good at detect small changes in the data.→正确表达She is very good at detecting small changes in the data.

介词 at 后面必须接名词或动名词，不能直接接动词原形；detect 需变为动名词 detecting。

易错句子This new test can detect out the virus at an early stage.→正确表达This new test can detect the virus at an early stage.

detect 是及物动词，直接跟宾语，不需要加 out；汉语“检测出”的“出”不应直译为 out。

易错句子The guard detected the man to enter the building.→正确表达The guard detected the man entering the building.

detect 表示“察觉到某人正在做某事”时，用 detect + 宾语 + 现在分词，不用 to 不定式；类似 see/hear/notice 的用法。