到6个星期大时，大多数婴儿开始表现出近似于日夜分明的睡觉模式。By about 6 weeks of age, most babies begin to show something approximating a day/night sleeping pattern.神经元的本体, 其作用近似于一种线性阀值器件.The body of a neuron. Acts approximately as a linear threshold...
...a gravel path leading to the front door.通向前门的石子路Sandstone and conglomerate are the consolidated equivalent of sand and gravel.砂岩和砾岩分别是砂和砾石固结的产物.I've got half a ton of gravel in the lorry but he won't sign my...