2let mut typechecker = typecheck::Typechecker::new();
妈妈向我解释，她知道外公的教育观念落后，因此再三叮嘱他们只需管好我的吃住，不必在其他方面插手。于是一到周末，外公外婆给我做饭、洗校服。我们之间的话题始终围绕吃住。他们面对我总是一副小心翼翼的样子。我赞同她当年的明智，却也慢慢意识到，照料可以留下恩情，却未必能生出真正的亲近。
Advances the state of the art with regards to papers noted by Shalizi, or answers questions asked by Shalizi et al (2 points)，这一点在新收录的资料中也有详细论述
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，更多细节参见新收录的资料
The board's spokesperson Jerome Sam acknowledged that while there had been delays in farmers getting their money, payments were now being processed.，推荐阅读新收录的资料获取更多信息
function cons(head: Tree, tail: Forest): Forest {