... inspect rigidly严格视察 inspect periodically周期性地视察 inspect purposely有目的地视察 ...
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inspect periodically
定期检查
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Under current rules, companies must bury pipelines 4 feet beneath a riverbed and inspect them periodically.
NPR: APNewsBreak: $1.7M Penalty Proposed In Exxon Spill
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