近義詞：keep up保持
真題例句：A planet's行星 ability能夠 to retain保持 an atmosphere大氣 depends on取決于 its temperature溫度 and mass大量.
This is great好 for her，and for us as we retain保持 someone highly qualified有資格的.
The country struggled奮鬥 to retain 保持independence獨立。
His only hope was to retain their friendship友情.
detain動詞，拘留—detained動詞，扣留—detainee名詞，被拘留者—
詞根詞源：de來自 tain握住→抓住不讓走→detain拘留
前綴：de從，向下
詞根：tain保留，持有
Two suspects嫌疑人 were detained拘留.
The act行為 allows允許 police 警察to detain 拘留a suspect 嫌疑犯for up to 48 hours
retail chain/credit/dealer/industry零售連鎖/零售信貸/零售商/零售工廠
詞根詞源：re往後 tail剪，切→切下來→retail零售
前綴：re回，對立
詞根：tail剪，割
Unfortunately，part of the explanation 解釋is that the Census人口普查 retail 零售date數據 are unreliable不可信.
近義詞：sell動詞，銷售vend動詞，售賣trade名詞，貿易
常用詞組：retail park/chain（城鎮邊緣的）商業區/零售連鎖
John purchased購買 chocolates巧克力 from the retail 零售store商店.
The shpopping商店 district地區 has many retail stores to buy clothes衣服.
retail名詞 零售retain動詞，保持；聘請
regain動詞，重新獲得；回到detain動詞，阻留，拘留
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