The adverbs 大大 and 远远 "greatly"
The adverbs 大大 
and 远远 emphasize a large number or a high degree of something.
The adverb 远远 is usually used in the following collocations:
远远超过
远远大于
远远超出
远远超越
and 远远 emphasize a large number or a high degree of something.
The adverb 远远 is usually used in the following collocations:
远远超过
远远大于
远远超出
远远超越
Pay attention
These adverbs can only be followed by a two-syllable verb.
Examples
结果，服务被大大减少了
As a result, the services have become much cheaper
jiéguǒ, fúwù bèi dàdà jiǎnshǎo le
这项研究大大提高了我们对语言学习的认识
This research has greatly improved our understanding of language learning
zhè xiàng yánjiū dàdà tígāo le wǒmen duì yǔyán xuéxí de rènshi
这本书优点远远大于缺失
This book has many more advantages than the disadvantages
zhè běn shū yōudiǎn yuǎnyuǎn dàyú quēshī
成功之大远远超过他们的预期
The amount of success experienced has greatly exceeded their expectations
chénggōng zhī dà yuǎnyuǎn chāoguò tāmen de yùqī
These adverbs can be followed by the particle 地 .
.Examples
野外生活被大大地高估了
Life in the wild is highly overrated
yěwài shēnghuó bèi dàdà de gāogū le
地球上的蚂蚁数量远远地超过了任何其它动物
here are many more ants than any other animals on the Earth
dìqiú shàng de mǎyǐ shùliàng yuǎnyuǎn de chāoguò le rènhé qítā dòngwù