Such changes are all but invisible over the short time scale of modern observations, and, it is argued, they are usually obscured by innumerable gaps in the imperfect fossil record.
这些变化在现代观测短时间范围内几乎是看不见的，而且，有人认为，这些变化常常被不完善的化石记录中的无数空白所掩盖。
Service is like a invisible chain, we should welcome customs with our sincere smile when they come in, foresee the customs' need and record the interest and habit when we observe their behavior.
服务就像是一条无形的链锁，客人到来时我们要以最诚挚的笑容欢迎客人的到来应当发自内心；当观察到客人的言行举止，我们要做到预知客人的所需，此后应该记录下客人的喜好和习惯；
Service is like a invisible chain, we should welcome customs with our sincere smile when they come in, foresee the customs' need and record the interest and habit when we observe their behavior.
服务就像是一条无形的链锁，客人到来时我们要以最诚挚的笑容欢迎客人的到来应当发自内心；当观察到客人的言行举止，我们要做到预知客人的所需，此后应该记录下客人的喜好和习惯；
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