莫大的英文：
greatest
most important

参考例句：

He was born with a malformed foot --- a disability which tortured him with self-consciousness in his youth.
拜伦生下时，一只脚就带有残疾——这使他在年轻时候极为敏感，由此给他带来莫大的痛苦。

Good health is a great asset.
健康就是莫大的财富。

It is a great privilege to know you.
认识你真是莫大的荣幸。

He considered it a gross insult.
他认为这是莫大的侮辱。

Your presence will afford us great pleasure.
你的光临将给与我们莫大的荣幸。

I feel highly honored by your kindness.
您的好意使我感到莫大的光荣。

There have been good results in the experiment that have given him great encouragement.
实验中的良好结果给了他莫大的鼓舞。

Listening to the radio in my spare time is the most enjoyable thing in the whole world.
闲暇时听收音机是我莫大的享受。

Your solicitude was a great consolation to me
你对我的关怀给了我莫大的安慰。

This was to be Goering's prodigious air achievement.
这是戈林在空军方面莫大的成就。

greatest是什么意思：
adj. 最好的，最伟大的

The greatest minds are capable of the greatest vices as well as the greatest virtues. ——Descartes
最有才智的人们能做出最大的好事，也能做出最大的坏事。——笛卡尔

Sound heath is the greatest of gifts, contentedness, the greatest of riches, trust, the greatest of qualities.
健康为最好的天赋，知足为最大的财富，信任为最佳的品德。

Over the greatest beauty hangs the greatest ruin
红颜多薄命

The greatest hate springs from the greatest love
最大的恨产生于最大的爱

The greatest difference was noted in extension.
伸展测试的差异是最显著的。

important是什么意思：
a.
重要的，重大的；有权力的，有地位的，有影响力的

be of importance;matter
有重要性;有关系

He is an important official in the government.
他是政府的要员。

This is important to the development of dairy industry.
这对乳品业的发展很重要。

Christmas is an important feast for Christians.
圣诞节是基督徒的重要节日。

(degree of)importance,seriousness or influence
重要性、严重性或影响力（的程度）