yī xīn yī yì​

Meaning:  Whole-heatedly, to give something your undivided attention

Literal translation: One heart, one desire/intention, essentially "one heart, one mind"

Example Sentences:

1. 她一心一意地照顾她生病的父母。

Tā yī xīn yī yì de zhàogù tā shēngbìng de fùmǔ.

She wholeheartedly took care of her sick parents. 

2. 为了考上好大学，我一心一意地学习中文。

Wèile kǎo shàng hào dàxué, wǒ yīxīnyīyì dì xuéxí zhōngwén.

In order to get into a good university, I study Chinese wholeheartedly.

sān xīn èr yì​

Meaning:  Half-hearted, indecisive, divide your attention 

Literal translation: Three hearts two intentions/desires, essentially "three hearts, two minds"

Example Sentences:

1. 明天举行的活动，我还是三心二意，不知道要不要参加。

Míngtiān jǔxíng de huódòng, wǒ háishì sān xīn èr yì, bù zhīdào yào bù yào cānjiā.

I'm still indecisive about whether to participate in the event tomorrow.

2. 他对两所大学都很喜欢，所以一直三心二意地选择。

Tā duì liǎng suǒ dàxué dōu hěn xǐhuān, suǒyǐ yīzhí sān xīn èr yì de xuǎnzé.

He likes both universities a lot, so he has been indecisive about which one to choose.

luàn qī bā zāo

Meaning:  messy

Literal translation: Disorder seven eight mess/rot/ruined

Example Sentence:

1. 他的时间安排总是乱七八糟，经常迟到。

Tā de shíjiān ānpái zǒng shì luàn qī bā zāo, jīngcháng chídào.

His schedule is always in a mess, and he's often late.

2. 最近，我的心情乱七八糟的。

Zuìjìn, wǒ de xīnqíng luànqībāzāo de.

Recently, my mood has been all over the place.

dú yī wú èr

Meaning:  Unique, unparalleled, second to none 

Literal translation: Only one, there is no two  

Example Sentences:

1. 在上海，我买了一些 独一无二的礼物送给家人。

Zài shànghǎi, wǒ mǎile yīxiē dúyīwú'èr de lǐwù sòng gěi jiārén.

In Shanghai, I bought some unique gifts for my family. 

2. 去中国留学是一个独一无二的经验。如果你有机会，一定要去！

Qù zhōngguó liúxué shì yīgè dúyīwú'èr de jīngyàn, rúguǒ nǐ yǒu jīhuì, yīdìng yào qù!

Studying abroad in China is a unique experience, if you have the opportunity, you should definitely go!

yī mō yīyàng

Meaning:  Exactly the same

Literal translation: One mould, one appearance

Example Sentences:

1. 他和他爸爸长得一模一样。

Tā hé tā bàba zhǎng dé yī mō yīyàng.

He looks exactly like his dad. 

2. 西安的兵马俑和我想象的一模一样。

Xī'ān de bīngmǎyǒng hé wǒ xiǎngxiàng de yīmōyīyàng.

The terracotta warriors in Beijing were exactly as I imagined.

rùxiāng suísú

Meaning:  Enter village follow customs

Literal translation: Do as the Romans do

Example Sentence:

1. 留学的时候我决定入乡随俗： 说中文，用筷子，喝热水，等等。

Liúxué de shíhòu wǒ juédìng rùxiāngsuísú: Shuō zhōngwén, yòng kuàizi, hē rè shuǐ, děng děng.

When I was studying abroad, I decided to do as the Romans do: speak Chinese, use chopsticks, drink hot water, etc.

yī jǔ liǎng dé

Meaning:  Two acts, one objective 

Literal translation: To accomplish two objectives with one act (basically "two bird one stone") 

Example Sentence:

1. 学习新的单词不仅能提高词汇量，也能增强语言能力，真是一举两得的学习方式。 

Xuéxí xīn de dāncí bùjǐn néng tígāo cíhuì liàng, yě néng zēngqiáng yǔyán nénglì, zhēnshi yījǔliǎngdé de xuéxí fāngshì.

Learning new words can not only improve your vocabulary, but also enhance your language skills. It is really a way of learning that kills two birds with one stone.

gè zhǒng gè yàng

Meaning:  all kinds of, a variety

Literal translation: Every kind, every type 

Example Sentences:

1. 我面对了各种各样的压力。

Wǒ miàn duìle gè zhǒng gè yàng de yālì.

I faced all kinds of pressure.  

2. 为了健康，我吃各种各样的水果和蔬菜。 

Wèile jiànkāng, wǒ chī gè zhǒng gè yàng de shuǐguǒ hé shūcài.

For health, I eat all kinds of fruits and vegetables. 

shì jiè gè dì

Meaning:  All around/over the world 

Literal translation: World every land

Usage Example:

1. 在北京学习的外国留学生来自世界各地。

Zài běijīng xuéxí de wàiguó liúxuéshēng láizì shìjiè gèdì.

The foreign students studying in Beijing came from all around the world.