This is a problem not infrequently encountered by postdocs.
这是一个博士后学生经常遇到的问题。
Differential diagnosis of the disease is not infrequently difficult.
这种病的鉴别诊断往往很难。
A few times she had seen her at the piano in the parlour, and not infrequently had heard her play.
有几次她看到她坐在客厅的钢琴前，还经常听到她弹琴。
It not infrequently happens that what were thought to be correct statements of natural laws turn out to be wrong, or at least subject to modification.
本来认为是正确的自然规律的论述结果却证明是错误的，或者至少也得修改一下，这样的事情是经常发生的。
I'd review all the facts of the case and, not infrequently, wonder if I hadn't made a poor decision.
我会重温那位急诊病人的整个病情，常常怀疑自己做出了不妥的决定。
Not infrequently does the septuagenarian go abroad.
那个年逾古稀的老翁经常出国。
Not infrequently does the septuagenarian walk over distance to Daming Lake Park.
那位年逾古稀的老翁经常从很远的地方步行去大明湖公园。
Not infrequently, the flames of conflict flare up again just a few weeks or months after a cease-fire is signed.
有时候，停火协议签订后只几个月，甚或几个星期，战火又再 燃起，这种情况 屡见不鲜。
Not infrequently, this room had glass walls, through which visitors could gawk at the great electronic wonder inside.
这样的情形不少见：这房间里有玻璃墙，游客可通过玻璃墙呆呆地看着里面伟大的电子奇迹。
Not infrequently, employees ask to work an extra twenty hours a week to earn enough money to help members of their extended family buy their first home.
雇员常 常会要求一周加班20小时，好多赚钱帮助大家庭成员购买房屋。
Not infrequently, during a demanding day at work, I would find a deliveryman standing in my office with a boxed lunch Alex had ordered for me, to make sure I remembered to eat.
在我工作很忙的时候，经常会有送外卖的人来出现在我的办公室来给我送午饭之类的，不用说，当然是艾利克斯定的，他怕我一忙起来就忘了吃饭。
Not infrequently, during a demanding day at work, I would find a deliveryman standing in my office with a boxed lunch Alex had ordered for me, to make sure I remembered to eat.
在我工作很忙的时候，经常会有送外卖的人来出现在我的办公室来给我送午饭之类的，不用说，当然是艾利克斯定的，他怕我一忙起来就忘了吃饭。
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