副詞 at a time:

1. simultaneously
   同義詞：at once, at one time

1. Personal enmities must be forgotten at a time of national crisis.
   民族危機(jī)當(dāng)頭，必須捐棄個(gè)人恩怨。
2. Such waste of money should be deprecated at a time like this.
   在這種時(shí)候應(yīng)大力反對(duì)如此浪費(fèi)金錢。
3. He used to abandon his work for months at a time.
   他過去每次放下工作就是幾個(gè)月。
4. If only problems would come one at a time!
   要是問題一次只發(fā)生一個(gè)該多好！
5. He tossed the peanuts into his mouth one at a time.
   他每次將一?；ㄉ舆M(jìn)嘴里。
6. Female sheep produce one or two lambs at a time.
   母羊一次生一到兩只羊羔。