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84. at one time: 一度，曾经=once/once upon a time
At one time, people would not have hesitated to light up a cigarette in stations, restaurants, or hospital waiting rooms.
曾经，人们会毫不犹豫地在车站、餐厅或医院候诊室吸烟。
hesitate to do something 因有顾虑而不愿做某事
at times 有时，不时
She is annoying at times. 她有时候很烦人。
at a time 一次，每次
Take two pills at a time. 一次吃两粒。
at the time 那时
She was still with him at the time. 那时他们还在一起。
85. be likely to do something: 有可能的，有……倾向的
liable 表“倾向”时，一般指不太好的方面，“有……危险/倾向，可能遭受……”
liable to depression 容易患抑郁症
be apt to do: 表“倾向”源于对逗人或某事过往行为、表现的判断
be apt to lose his temper 动不动就发脾气
be prone to: 也指不好的倾向
prone to nerves 容易紧张
86. rank with: 位列，名列
His research ranks with the best of the kind.
他的研究属于同类研究中的佼佼者。
87. be immune to something : 不受……影响的；免除
immune from prosecution 免于起诉
immune system 免疫系统
diplomatic immunity 外交豁免权
At one time, people would not have hesitated to light up a cigarette in stations, restaurants, or hospital waiting rooms.
曾经，人们会毫不犹豫地在车站、餐厅或医院候诊室吸烟。
hesitate to do something 因有顾虑而不愿做某事
at times 有时，不时
She is annoying at times. 她有时候很烦人。
at a time 一次，每次
Take two pills at a time. 一次吃两粒。
at the time 那时
She was still with him at the time. 那时他们还在一起。
85. be likely to do something: 有可能的，有……倾向的
liable 表“倾向”时，一般指不太好的方面，“有……危险/倾向，可能遭受……”
liable to depression 容易患抑郁症
be apt to do: 表“倾向”源于对逗人或某事过往行为、表现的判断
be apt to lose his temper 动不动就发脾气
be prone to: 也指不好的倾向
prone to nerves 容易紧张
86. rank with: 位列，名列
His research ranks with the best of the kind.
他的研究属于同类研究中的佼佼者。
87. be immune to something : 不受……影响的；免除
immune from prosecution 免于起诉
immune system 免疫系统
diplomatic immunity 外交豁免权
