Definition: to put something somewhere quickly or secretly Level: C2
她把信快速塞进信封并封好。
She ___slipped the letter ___into an envelope and sealed it.
他把纸条从门缝里快速塞过去。
He ___slipped the note ___through the gap in the door.
间谍神不知鬼不觉地把微缩胶片塞进口袋。
The spy ___slipped the microfilm ___into his pocket unnoticed.
