detection：觉察，发觉，侦查，探测  

词根词缀：de-去掉 + -tect-掩盖 + -ion名词词尾

• finicky
• finish
• finishing school
• finishing touches
• finite
• fink
• fir
• fire
• firebrand
• firebug
• fireman
• fireplace
• fireproof
• firewall
• firewater
• firewood
• firkin
• firm
• firmament
• firmness
• first
• firth
• fiscal
• fish
• fishwife