691. at times (=occasionally) 间或, 时常
at all times (=always) 始终, ;总是
692. at a time 一次, 每次; 同时
693. on top of 在…上面
694. in total (=all have been added up)& nbsp;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…的;be true to 忠于…
697. to trust …to 把…委托给
698. place (put, have) trust in 依赖
699. in truth 事实上, 实在
700. by turns 轮换地