HSK 5
Qīngxìn mòshēngrén kěnéng shì yǐnlángrùshì.
Trusting strangers too easily can invite disaster.
HSK 7-9
Gùyòng tā jiù děngyú yǐnlángrùshì.
Hiring him is like inviting a wolf into the house.
HSK 7-9
Tā méixiǎngdào zìjǐ shì yǐnlángrùshì.
He didn't realize he was letting the wolf in.