At the Synthesis stage, we select the Top Down compile strategy, and suppose an ideal clock.
综合阶段采用的是自顶向下的编译策略，并虚拟理想时钟。
Find something that makes a very quiet, steady sound. A small fan on a low setting or a real, non-electric, ticking watch or clock are ideal.
找一些安静、稳定的东西，一台低音的小风扇，一只电子手表或钟是一个很好的选择。
In reindeer, even if they're missing a circadian clock, melatonin levels still spike when it's dark and drop when it's light, making the equinoxes an ideal time to synchronize their annual clocks.
而驯鹿呢，虽然它们没有昼夜节律钟，其褪黑激素水平仍然会在黑暗的时候上升，光亮的时候下降，从而使它们的昼夜分点达到理想状态，进而与年生物钟同步。
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