A very common source of writer’s block is the constant need of a “meaning”, or a “form”, or some sort of constraint, like the size (1000 words by noon, ok?). This can be really pressuring.
作家一个很常见的瓶颈就是非要有个写作的"意义",或者一种"形式",或者其他的一些限制,例如字数(比方说到中午要写够1000字,是吧?)
Fans and air filters add to the distractions, so some astronauts wear ear plugs to block out the constant hum.
风扇和空气过滤器是另一个干扰源，因此有的宇航员会戴耳塞，挡住这些持续不断的嗡嗡声。
Because constants are an important building block for constructing expressions, it is important to be able to write constant values for each of the basic data types.
因为常量对于构造表达式非常的重要，所以学会书写每种基本数据类型的常量就显得至关重要了。
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