Hurdle Word 1 hintAn expression.
if (len === 0) return [];，详情可参考safew官方版本下载
，这一点在safew官方版本下载中也有详细论述
The bigger they come, the slower they move
Access to affordable childcare remains a major constraint, and high income taxes and complex benefits can discourage people, especially second earners, from working more hours.，更多细节参见快连下载安装