take good care of, maintain maintain, repair maintain secrecy maintain, remain keep, maintain, preserve maintain one’s composure, stay calm 
in gutem Zustand halten Wartung (der Ausrüstung) Geheimhaltung behalten beibehalten. nicht mit der Wimper zucken 
mantenere in buone condizioni manutenzione (delle attrezzature) segreto tenere mantenere non battere ciglio 
maintenir en bon état la maintenance (des équipements) secret conserver maintenir ne pas battre des paupières 
mantener en buen estado mantenimiento (del equipo) secreto mantener mantener no batiendo un párpado stabil,ruhig,aufrechterhalten 安定 wahren, aufrechterhalten, halten 保持 geheim halten, ein Geheimnis bewahren 保密 sich bei Kräften halten,um s. Gesundheit kümmern 保养 wahren, aufrechterhalten 维持 Vitamin 维生素 take good care of, maintain 47 保养 [-養] bǎoyǎng (care-maintain) take good care of, maintain: ~身 体take good care of our health || 车辆~ car maintenance 363 ' maintain, repair 3 维修 [維-] wéixiū (maintain-repair) maintain, repair: ~电器 repair the electrical appliances || ~设备 maintain equipment || 古建筑 (jiànzhù) ~ maintain/repair ancient architecture ' maintain secrecy 32 保密 [-] bǎomì (keep-secrecy) maintain secrecy: 对我~ keep my secret || 绝对~ absolutely secret || 需要~ needs to be kept secret ' maintain, remain 24 保持 [-] bǎochí (keep-hold) maintain, remain: ~不变maintain consistency || ~联系 maintain content || ~清洁 remain clean ' keep, maintain, preserve 26 维持 [維-] wéichí (maintain-hold) keep, maintain, preserve: ~现 状 maintain the current status || ~生活 maintain life || ~关系 maintain relations ' maintain one’s composure, stay calm 37 不动声色 [-動聲-] búdòng shēngsè (not-stir-voice-face) maintain one’s composure, stay calm: ~ 地听着 maintain one’s composure while listening || ~地回答 maintain one’s composure in answering '
Đội trưởng phải duy trì kỷ luật trên chiếc tàu của mình. 
The captain has to maintain discipline aboard his ship.
Der Kapitän muss Disziplin an Bord seines Schiffes aufrechterhalten.
กัปตันต้องรักษาวินัยในเรือ
船长必须在他的船上保持纪律。