欣然的英文：
agreeably
be glad of heart
cheerly
delightfulness
fain
would as soon

参考例句：

He agreed to our plan with a good grace.
他欣然地同意了我们的计划。

He sniffed the green tea in the cup appreciably.
他欣然闻了闻杯里的绿茶香味。

To jump at an offer
欣然应承

He accepted the invitation with alacrity.
他欣然应邀

He gladly acknowledged himself to be in the 'wrong.
他欣然认错。

The explorer was glad to dilate on his experiences.
探险家欣然详述他的经验。

"If you command wisely, you'll be obeyed cheerfully"
倘君指挥有方,人人欣然听命

Many people had cheerfully contributed to the Red Cross.
许多人都欣然向红十字会捐款。

We should be pleased to let you have samples to give a demonstration at your premises.
欣然奉上我方产品样品,在贵方展厅展出

Caroline obeyed with alacrity, and Grace spent a welcome moment by herself
卡罗琳欣然从命，而格雷斯自己也乐得清静一会。

agreeably是什么意思：
ad. 愉快地,欣然

be agreeable to sth
欣然同意某事

This is an agreeable surprise.
这是一个惊喜。

Mr. Pound is quite agreeable.
庞德先生是欣然同意的。

glad是什么意思：
adj. 高兴的；乐意的；明媚的

a glad day, moment, etc
令人高兴的日子、 时刻等.

a glad May morning.
一个明媚喜人的五月的早晨

The wedding was on a glad day in may.
婚礼是在阳光明媚的一个五月天举行的。

heart是什么意思：
n. 心，感情，热忱，内心，中心，红桃

They exchanged their views heart to heart.
他们推心置腹地交换了意见。

Distance is naught while heart with heart can meet.
心心能相印，距离等于零。

get/learn by heart
记住,背诵