It is about the size of a grain of rice and is called the stirrup.

它的大小大约是一粒米，被称为马镫。

youdao

The ivory Buddha carved by Shen Weizhong is the world's smallest piece of sculpture, its size being just four-fifths of a grain of rice.

沈为众雕刻的象牙佛像是世界上最小的雕刻，它只有一粒米的五分之四大。

youdao

If I win the game, I'd like one grain of rice for the first square of the chessboard, two for the second, four for the third, and then double the amount for each of the rest of the squares.

如果我赢了，我想在棋盘的第一个方格里放一粒米，在第二个方格里放两粒米，在第三个方格里放四粒米，然后在剩下的方格里依次放两倍的米。

youdao

Since 2008 the United States has not sold a single grain of rice to Cuba.

VOA: standard.2010.07.29

So the inventor of the chess game said, "Ok. What I like is on the first block, first square, I would like one grain of rice.

于是象棋发明者说，“好吧，我希望，在第一个方格上，我想要一粒大米。

哈佛公开课 - 幸福课课程节选

Brown rice is the naturally occurring form of the grain.

VOA: standard.2010.06.25

Anytime a black-eyed pea meets a grain of rice, it becomes Hoppin' John.

NPR: Vertamae's Hoppin' John

And have your vet inject your pet with a tiny microchip implant (it's about the size of a grain of rice).

CNN: Tips for road tripping with pets

Micro chipping involves a vet inserting a tiny device, about the size of a grain of rice, under the dog's skin.

CNN: Give a dog a cell phone