S1 1 This module provides various time-related functions. 1 Although this module is always available, not all functions are available on all platforms. 句子中although是一个从属连词，引导状语从句，翻译尽管但是的语句的时候，不能和but连用，因为but是并列连词(FANBOYS)，并列句前后的句子必须具有相同的等级，所以although和but不能连用。同理，because和so也不能连用。 1 An explanation of some terminology(术语) and conventions(惯例) is in order. 1 Mapping is A container object that supports arbitrary(任意的) key lookups(查找) and implements the methonds specified in the Mapping or MutableMapping. (mutable易变的, immutable不可变的) 赞微海报分享
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