tian（1声）chang（2声）
非常规天然气资源 unconventional gas resources
反常天气 extraordinary weather ; abnormal weather
寻常型天疱疮 Pemphigus vulgaris ; PV
先天异常 congenital anomalies
先天性异常 [医] congenital anomaly ; congenital abnormality ; Congenital anomalies ; congenital abnormalities
天文常数 astronomical constants ; [天] astronomical constant
寻常性天疱疮 Pemphigus Vulgaris
寻常天疱疮 [皮肤] Pemphigus vulgaris
变化无常的天气 variable weather ; changeable weather
一天，他看到他的美术老师常先生的一幅画。
我早发布，常发布(从未低于十天一次，在高强度的开发周期则每天一次)。
I released early and often (almost never less often than every ten days; during periods of intense development, once a day).
妈妈，我们在伦敦的时候，我可是常听你抱怨英国的星期天呢。
I've heard you often enough, mother, grumble at the English Sunday when we've been in London.
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