十九世纪上半叶 meaning in English

during the upper half of the19th

What signs of dynastic decline can be detected in china in the first half of the 19th century
十九世纪上半叶中国己经表现出那些朝代衰象?试说明之
In 1893 , there was an appointment that was to have extensive ramifications . francis may , one of a string of irishmen who headed the force in its first half - century , took command , aged 33 , and set to work like a whirlwind
在一八九三年， 33岁的梅含理出掌警队，在十九世纪上半叶，有多位爱尔兰人先后掌管警队，而梅含理是其中一个。
An old theorem from the first half of the nineteenth century by lowry , wallace , bolyai and gerwien asserts that any simple polygon can be dissected into a finite number of pieces and put back together to form any other simple polygon of the same area
十九世纪上半叶lowry ， wallace ， bolyai与gerwien同时证明了一个古老的数学命题：任意给定平面上一个简单多边形，必可将其分划成有限块，重新安排，拼成另一个任意给定的等面积的简单多边形。