偶然: accidental; fortuitous; casu ...失速: stall偶然失效: random failure偶然失效率: constant failure rate偶然失效期: constant failure period自然失速特征: natural stall characteristics随机故障 随机失效 偶发故障 偶然失效: randomfailure失速: [航空] stall◇失速飞行控制 automatic prevention control; 失速滑翔 stalled glide; 失速警告指示器 stall indicator; 失速平坠着陆 pancake landing; packing; 失速状态 stall conditions偶然: accidental; fortuitous; casual; incidental; occasional; in case of accident; by coincidence; by chance; accidently; by accident; chance; chance to; have a chance to; happen to; it just so happened that ...: 偶然现象 accidental [fortuitous] phenomena; 偶然事件 accident; a chance event; 偶然原因 an occasional cause; 偶然遇见一个老朋友 run into an old acquaintance; meet an old friend by chance; come across an old friend; 偶然相识的人 an incidental acquaintance; 出现这种问题绝不是偶然的。 the occurrence of such things is by no means fortuitous. 我在伦敦一家小店里偶然发现那件古物。 i struck upon that antique in a little shop in london当然失效: ipso facto avoidance倒坍,突然失败: collapse纷然失心: the mind-essence will be lost in confusion茫然失措: be all adrift; be besides oneself; be out of the wits [senses]默然失色: soulful eclipse使暗然失色: eclipse使黯然失色: take the shine off突然失败: suffer a nervous collapse突然失能: sudden incapacitation突然失稳: snap buckling突然失效: catastrophic failure; sudden failure呀然失惊: be taken unawares and become quite frightened哑然失色: flabbergasted哑然失声: dumbfound哑然失笑: can't help laughing; break into laughter; chuckle to oneself; can't suppress one's laugh; be unable to swallow a laugh; laugh involuntarily; unable to stifle a laugh自然失业: natural unemployment