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onto有时表示“抓住不放”(以免自己掉下去):
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She had to hold onto the edge of the table.她得抓住桌子边。
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He held on to the rope.他紧紧抓住绳子。
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661 once (adv. & conj.)
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once可用作副词,表示“一次”:
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Once a week she went out shopping.她一周出去买一次东西。
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I see them once every two months.我两个月见他们一次。
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Once or twice he had seen them come to blows.有一两次他看见他们打了起来。
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还可表示“过去(有一次)”、“曾一度”:
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Once dinosaurs walked on these plains.过去恐龙曾一度在这些平原上活动。
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He once knew her, but they are no longer friends.他过去认识她,但现在不再是朋友了。
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Once in the night I woke and heard the wind blowing.有一次夜里我醒来听见风在刮。
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once upon a time常用来开始一个故事:
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Once upon a time a highwayman lived in this house.从前有一个强盗住在这间屋子里。
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at once可表示“立即”:
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You must come home to him at once.你必须立即回家,回到他身边。
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I knew at once that something was wrong.我立即知道出了问题。
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all at once可表示“突然”,也可表示“同时(一道)”:
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All at once, I remembered.突然我记起来了。
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Don’t all speak at once!大家不要同时讲话!
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once还可用作连词,表示“一(旦)……就”:
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Once you began you couldn’t stop.你一旦开始就停不下来了。
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Once you have learned Spanish you will find Italian easy.你一旦学了西班牙语,就会发现意大利语不难了。
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Once you’ve finished, go to bed.你一干完就睡觉。
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