Teaching is supposed to be a professional activity requiring long and complicated training as well as official certification.

教学常被视作一种职业行为，需要经过长期复杂的训练，并需要获得官方的认可。

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Teaching is supposed to be a professional activity requiring long and complicated training, as well as official certification.

教学是一个专业的活动，要求长时间的复杂的培训，这样的培训就像是官方证书一样严格。

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On the aim of professional activity, we oppose apposing the unselfish dedication and individual interests, and incline to combine them together.

人们不主张将无私奉献与为个人利益奋斗相对立，而是倾向于将二者有机结合。

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If the rental real estate activities are section 162 trades or businesses, the rules in section 469(c)(7) and Sec. 1.469-9 will apply in determining whether a rental real estate activity of a real estate professional is a passive activity for purposes of section 1411(c)(2)(A).

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They will watch the reports in coming weeks to get a more steady reading on jobless claims, while unemployment is still being reflected in the still subdued consumer spending activity and slow hiring in construction and professional business services.

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However, if the rental real estate activities of the real estate professional are not section 162 trades or businesses, the gross income from rents derived from such activity will not be excluded under section 1411(c)(1)(A)(i) by the ordinary course of a trade or business exception.

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