691.at time 间或,时常
at all times 始终,总是
692.at a time 一次,每次;同时
693.no top of 在上面
694.in total 总计
695.be in touch with 与有接触,有联系
be out of touch with 与没有联系或接触
696.be true of 适合于be true to 忠于
697.to trustto 把委托给
698.place trust in 依赖
699.in truth 事实上,实在
700.by turns 轮换地
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