2007-03-15 
in sight 被见到，看得见；在望
lose sight of 不再看见；忽略；忘记
out of sight 看不见，在视野之外
sign in 签到；签收
sign on 签约受雇用
keep silence 保持沉默，不讲话
ever since 从那时起一直到现在
long since 很久以前
single out 挑选出，选拔，找出
sit on 为…的成员；压制
sit up 迟睡，熬夜；坐正
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