中英释义：
双语例句
如果不定期检查，这种疾病可能未被发现。
The disease can go undetected without regular check-ups.
重点词汇
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不定期
irregular; unscheduled; nonperiodic; sporadic; intermittent
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检查
check; test; inspect; examine; review; audit; survey; vet; monitor; screen; see; suss; look; process; probe; censor; check up; testing; inspection; exam; examination; checkup; check-up; scrutiny; policing; censorship; screening