The production of grain has been increased by four times this year.今年粮食产量增加了4倍这个句子用了现在完成时 下面这个句子:The grain output is 8percent higher this year than that of last year.今年比去年粮食产量

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Theproductionofgrainhasbeenincreasedbyfourtimesthisyear.今年粮食产量增加了4倍这个句子用了现在完成时下面这个句子:Thegrainoutputi

The production of grain has been increased by four times this year.今年粮食产量增加了4倍这个句子用了现在完成时 下面这个句子:The grain output is 8percent higher this year than that of last year.今年比去年粮食产量
The production of grain has been increased by four times this year.今年粮食产量增加了4倍
这个句子用了现在完成时
下面这个句子:
The grain output is 8
percent higher this year than that of last year.今年比去年粮食产量增加8%
为什么不需要?
还有在书写的时候数字直接写 不用eight这样写吗?
应该完成时被动语态

The production of grain has been increased by four times this year.今年粮食产量增加了4倍这个句子用了现在完成时 下面这个句子:The grain output is 8percent higher this year than that of last year.今年比去年粮食产量
时态问题:第一个句子的动词用的是increase,增长,是一个已经完成的动作,所以用完成时;第二个句子直接用系动词is,表示现在的状态,所以用现在时.俩都对,两种方式都可以用.

书写问题:对,欧美国家一般也用阿拉伯数字,所以直接写没问题,但特别正式或者需要准确说明的文件一般都用英文写数字,而不用阿拉伯数字.

第一个句子表示所描述的事情已经完成;
第二个只是陈述一件事情,不带任何感情。
在选择上,要根据情景需要选择不同的表达方式。
对于写作时是否将数字转化成相应的英文,视自己的写作习惯和语感吧。

前句完成时表示已经完成
后句因为是和去年的比较所以用现在时

没有规定写作时数字的写法

the production of uncultured specialist 请翻译一下, 英语翻译The influence of the manufacturing strategy onthe production of molds and dies The origin of LNG in China relies on the production of domestic and overseas 求短语翻译:a brief capsulation of the nature of the place and production roll off the production The new technique has ___ them to double the production of the factory 英语翻译date of production:indicated below on the pack Date of packing Many of the world's countries and regions have production of whisky distillery. 翻译 The production range consists both of a complex line of serial-made furnaces used for the production of high-quality,solvent and water resistant stencils什么意思used for the production of high-quality,solvent and water resistant stencils the transfer of the product from pilot run (prototypes) to serial production processes should be considered. 翻译一句话.the production of the product-mix most wanted by society 英语翻译the expression plasmid ● the host cell ● the derivation and cloning of the production cell line ● the cell bank system Description of the starting strain Preparation of the production strain Cell bank System Characterization of the date of production啥意思 Production of a product是什么意思 units of production method是什么意思 units of production method是什么意思 英语翻译The Glorious Production system provides the framework for achieving process and production excellent in manufacturing facilities.The Glorious Production system bring the strategies of Manufacturing Operating Rhythm,Built-in Quality,Lean a