a grain of

基本解釋

A little red hen once found a grain of wheat.
一次，一只紅色的小母雞找到了一粒小麥。
Tiny glass tubes, about half the width of a grain of rice, are carefully placed in the deep brain of an anaesthetized mouse.
很多極微小的玻璃管，大概是一粒米寬度的一半，被小心翼翼的置入一個(gè)被麻醉小鼠的大腦深部。
On my last holiday in the Bahamas, as I walked along the beach feeling the gentle waves wash over my feet, I felt part of the universe, even if only a minuscule one, like a grain of sand on the beach.
在巴哈馬最后一次度假的時(shí)候，當(dāng)我沿著海灘散步的時(shí)候，溫柔的海水拂過我的腳時(shí)，我感覺到我與宇宙融為了一體。盡管只是如海灘上的一粒沙子那樣渺小的一部分。

Researchers compared the use of fertilizer in three areas that grow maize as a major grain: China,Kenya and the United States.
in some ways, one has to admit also there maybe a grain, if not more than a grain of truth in what he seems to be saying.
我們多么不喜歡他，但必需承認(rèn),他可能有點(diǎn)兒道理，但就那么點(diǎn)兒,關(guān)于他所說的話。
耶魯公開課 - 政治哲學(xué)導(dǎo)論課程節(jié)選
Alright. So take it with a grain of salt.
好，我們就說到這里。
哈佛公開課 - 計(jì)算機(jī)科學(xué)課程節(jié)選

In fact, take all such daily explanations of market turbulence with a grain of salt.
FORBES: Market Turbulence Or Deeper Ills?