防盗知识也要牢牢掌握，要保持一定的警惕性。
Burglar must firmly grasp the knowledge necessary to maintain a certain of vigilance.
由于不公平的选区划分政策，国会中的多数议席始终牢牢掌握在两党之中一方的手中。
Most congressional seats are safely in the hands of one of the two parties, thanks to gerrymandering.
因此，优秀的内科医生不能仅仅认识不同肝脏疾病典型的表现，也应牢牢掌握非典型的表现。
Thus, the effective physician must not only understand the classic presentations of the various liver diseases but also have a firm grasp on the atypical presentations.
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