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- at sb's beck and call
- at sb.'s behest
- at sb.'s command
- at sb.'s disposal
- at sb.'s doorstep
- at sb.'s expense
- at sb.'s feet
- at sb.'s feet (或 at the feet of sb.)
- at sb.'s pleasure
- at sb.'s request
- at sb.'s service
- at school
- at sea
- at second hand
- at short a moment's, a minute's, ten minutes', 7-day, two hours', etc. notice
- at short (a moment's, a minute's, ten minutes', 7-day, two hours', etc.) notice
- at short notice
- at sight
- at sight of
- at sign
- at sixes and sevens
- at sixes and sevens
- at source
- at sparrow fart
- at speed
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