淡然的英文：
[Formal] cool; not too excited; indifferent

参考例句：

Especially when the bottle contains mineral water which tastes bland, the AA smell becomes unacceptable.
尤其是PET瓶子盛载淡然无味的矿泉水时，AA味道会变得难以接受。

formal是什么意思：
adj. 正式的；礼仪上的；有条理的；正规的；公开的 ；拘谨的

You should recast the report in formal wording as it is a formal occasion.
这是一个很郑重的场合，所以你的报告应改的正式一点。

A formal note is essentially a formal personal letter.
正式照会实质上是正式的个人函件。

They are very formal in their business transactions.
他们的商务议事很有条理。

cool是什么意思：
n. 凉爽
adj. 凉快的；冷静的；冷漠的；冷色的
adv. 冷静地
v. 使凉快；平息

Their love has cooled.
他们的爱情冷却了。

That jacket is so cool.
那个唱片套太酷了。

burner cooling system
[烧毛机]火口冷却装置

excited是什么意思：
adj. 兴奋的，激动的

a driver; an exciter
激励器

It was an exciting finish.
比赛结尾是激动人心的。

It was such an exciting game.
那场比赛真是精彩刺激。