It's not easy to observe my birthday at home and Mum cooked delicious meals for me.

难得在家过次生日，老妈做了很多可口的饭菜犒劳我。

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Evaluating people's efforts needs to be based on evaluating the value of what they are doing, not on things that are easy to observe.

评估人员的贡献需要基于他们所做事情的价值，而不是所容易观察到的事情。

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Aliasing, while not intuitive, is easy to observe (see Figure 10.24). If we sample 8.5 times slower (the circles), our reconstructed signal looks nothing like the original.

伪信号，如果采样率慢于某一周期的8.5倍(见图10.24)，那么显而易见我们的重建信号与原始信号直观上一点都不像。

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Unlike an obvious wave of bank repossessions, these other distressed sales are not as easy to observe or quantify resulting in what appears to be a relatively calm housing market that belies the still-significant distress below the surface.

FORBES: Expected Foreclosure Wave Weakened by Short Sale Rip Current

It's not an easy thing to observe, let alone predict what might happen next.

CNN: NASA flights will study Antarctic ice changes