斤(jīn)

Origin:

“斤”原指一种石斧,后来多用作重量单位名。一斤等于0.5 千克。
“斤” originally refered to a stone ax, and later came to be used as a unit of weight. One jin is equal to 1/2 kilogram.

Meaning:

axe; 1/2 kilogram

Words:

斤两(jīnliǎng): weight
斤斤计较(jīnjīn jìjiào): to haggle over every ounce
半斤八两(bàn jīn bā liǎng): not much to choose between the two

Sentences:

1、Píngguǒ duōshǎo qián yī jīn?
苹果多少钱一斤?
How much is half a kilo of apples?

2、Llǎoshí shuō ,wǒ jué de zhè liǎng ge hòuxuǎnrén bàn jīn bā liǎng.
老实说,我觉得这两个候选人半斤八两。
Honestly, I think the two candidates are like Tweedledee and Tweedledum.

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