汉语有两种类型的双重否定句式：一是一般的双重否定句式，这是连用两个否定词组成的；二是特殊的双重否定句式，这是由一个否定词和一个反问词组成的反问句。 There are two types of double-negative sentence patterns in Chinese: one is a general double-negative sentence pattern, which is composed of two negative words; the other is a special double-negative sentence pattern, which is composed of a negative word and a rhetorical question.
The unit of length refers to the basic unit for measuring the spatial distance, and is the basic unit formulated by humans to regulate the length. Its international unit is “meter” (symbol “m”), common units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km), meter (m), micrometer (μm), nanometer (Nm) Wait. The unit of length plays an important role in various fields.[全文 Read More…]