由于内核的存在，将出现两个新的与地球自转有关的章动模式，即顺向的自由核章动(PFCN)和内核摆动(ICW)模式。

Because of the inner core of the earth, there will have two nutation modes related to the earth's rotation, i. e. a prograde free core nutation (PFCN) mode and a inner core wobble (ICW) mode.

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于是我找了把更锋利的刀顺向纵切。

So I use a sharper knife and make a smooth and straight cut.

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济南空调维修建议在清洗时，用吸尘器或长毛软刷，按散热翅片顺向轻刷，除去附着的埃尘和脏物。

Ji 'nan air conditioning maintenance recommendations in cleaning, vacuum cleaner or plush soft brush, press the fin forward brush, remove dust and dirt attached.

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