Most 1st age class rhizomes of present year developed from the 2nd age classes.

当年形成的1龄级根茎大多是从2龄级根茎上产生。

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The age structure of rhizome length showed that the 1st and the 2nd age classes were equal on the whole, the 3rd age suddenly reduced.

根茎长度的年龄结构表现为1龄级与2龄级大体相同，3龄级陡度减少。

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Regulations such as minimum operating age, restricted operating areas and compulsory classes in water safety are essential.

诸如最低操作年龄、限制操作区域和水上安全必修课等规定是必不可少的。

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In eighteen sixty, at the age of seventeen, Mary began classes at the Pennsylvania Academy of the Fine Arts.

VOA: special.2009.07.12

She said her school had put staff training on hold and would have to do have mixed age classes to bridge the funding gap.

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Each tournament is broken down into different weight and age classes, from the junior competition (those under 21) to the highly-anticipated heavyweight class (any weight above 88kg).

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She says the numbers involved are small but they cross all social classes and age groups.

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