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今日， きょう， こんにち， こんち， こんじつ
1. today, this day
2. these days, recently, nowadays
今天
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曇り， 曇， くもり
1. cloudiness, cloudy weather
2. fog (on a mirror, glasses, etc.), cloud (e.g. in marble), blur, mist, shadow, dimness
3. gloom, dejection
阴云密布，阴天；雾（如镜面、眼镜等上的雾气）、云（如大理石中的云纹）、模糊、薄雾、阴影、昏暗；阴郁，沮丧
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
