把妳荒疏已久的技藝重新練好，準備擔負新任務。
《21世紀大英漢詞典》
We must prepare a room for our guest.
我們必須為客人預備壹個房間。
《新英漢大辭典》
prepare something=prepare for something這是在沒人的情況下，
有人的時候就是prepare something for somebody為某人準備。。。
因為prepare既是及物動詞又是不及物動詞也就是既可以直接加名詞也可以先加壹個介詞（壹般和介詞for連用）再加名詞。不知明白否？
prepare
英 [pr?'pe?] 美 [pr?'p?r]
vt. 準備；使適合；裝備；起草prepare something這是我添加的
vi. 預備；做好思想準備prepare for something這是我添加的
[ 過去式 prepared 過去分詞 prepared 現在分詞 preparing ]
柯林斯英漢雙解大詞典
prepare /pr?p?/ CET4 TEM4 ( preparing, prepared, prepares )
1.
V-T If you prepare something, you make it ready for something that is going to happen. 準備
例：
Two technicians were preparing a videotape recording of last week's programme.
兩名技師正在準備上周節目的錄像。
例：
On average each report requires 1,000 hours to prepare.
平均每份報告需要1000個小時來準備。
2.V-T/V-I If you prepare for an event or action that will happen soon, you get yourself ready for it or make the necessary arrangements. (為…) 作準備; 準備 (做某事)
例：
The party leadership is using management consultants to help prepare for the next election.
該政黨的領導層正聘用管理顧問來幫助準備下壹次選舉。
例：
He had to go back to his hotel and prepare to catch a train for New York.
他不得不回賓館準備趕火車去紐約。
3.
V-T When you prepare food, you get it ready to be eaten, for example, by cooking it. 準備 (食物)
例：
She made her way to the kitchen, hoping to find someone preparing dinner.
她朝廚房走去，希望看到有人在準備晚餐。