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| |||
| on and off; at times | |||
| occasionally; here and there; once and again; once in a way; once in a while; not very frequently (ART Vancouver); once in a rare while (Liv Bliss); once in a great while (SirReal); rarely; seldom; rarely | |||
| once in a while (way) | |||
| on occasion | |||
| on rare occasions | |||
| now and then (from time to time Val_Ships); now and again (from time to time Val_Ships); every once in a while (Val_Ships); if ever (Val_Ships) | |||
| infrequently (sporadically Val_Ships); at times (she is at times cruel and ruthless Val_Ships); seldom, if ever (rarely and probably never: The method seldom, if ever, fails. Val_Ships) | |||
| once in while | |||
| изредка: 25 短语, 7 学科 |
| 一般 | 13 |
| 俚语 | 1 |
| 实验室设备 | 3 |
| 数学 | 1 |
| 科学的 | 1 |
| 非正式的 | 1 |
| 马卡罗夫 | 5 |