马克西姆·加尔金身着紧身针织衫造型引发“他又来了”热议20:55
Путин заявил о готовности поставлять Европе нефть и газ19:01，这一点在搜狗输入法中也有详细论述
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Iran has remained defiant and announced Mojtaba Khamenei, the son of Ayatollah Ali Khamenei, will become the next supreme leader, after his father was killed last weekend. Days earlier, Trump rejected him as a possibility.
der(R1 · R2) = der(R1) · R2, plus der(R2) if R1 is nullable