The gentle slope type slope break belt controlled the development of the fan delta system.

断阶型缓坡坡折带控制着扇三角洲沉积体系的形成和分布；

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Many experts have applied the DELTA format and DELTA system in the taxonomies of various biological groups.

许多专家把DELTA格式和DELTA系统应用于各种生物类群的分类学研究中。

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The minor lake floods divided the stratum of the 6th segment into 4 tiny sequences, and the lakes and delta system were developed within each tiny sequence.

小型湖泛面将长6段地层分为4个小层序；各小层序内部都发育湖泊体系和三角洲体系。

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Delta v is positive in this direction here, the work is negative. So work on the system is positive. Work done by the system is negative.

功是负的，总而言之,外界对系统做功的符号为正。

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