每天背單詞 第342期

weak

英 [wi?k] 美 [wi?k]

adj. [經(jīng)] 疲軟的；虛弱的；無力的；不牢固的

例句：

She was too weak to stand.
她虛弱得站都站不住。

She is still weak after her illness.
她病后仍然虛弱。

His weak voice was almost inaudible.
他聲音微弱得幾乎聽不到。

null

英 [n?l] 美 [n?l]

adj. 無效的，無價值的；等于零的

n. 零，[數(shù)] 空

例句：

The contract was declared null and void.
合同被宣布無效。

A spokeswoman said the agreement had been declared null and void.
一位女發(fā)言人說那個協(xié)議已被宣布為無效的。

That vector is called a "null vector".
那種矢量就叫做”零矢量“。

transistor

英 [tr?n?z?st?(r); tr?n?s?st?(r)] 美 [tr?n?z?st?r,tr?n?s?st?r]

n. 晶體管（收音機）

例句：

This transistor radio has four small cells.
這臺半導(dǎo)體收音機用4節(jié)小電池。

Every transistor has at least three electrodes.
每個晶體管至少有三個電極。

This make of transistor radio is small and beautifully designed.
這半導(dǎo)體收音機小巧玲瓏。

rinse

英 [r?ns] 美 [r?ns]

vt. 漱；沖洗掉；漂凈

n. 沖洗；漂洗；[輕] 染發(fā)劑；染發(fā)

vi. 沖洗掉；漂凈

例句：

I gave the glass a rinse.
我把杯子沖洗了一下。

Make sure you rinse all the soap out.
一定要把皂液沖洗干凈。

I wanted to rinse the taste out of my mouth.
我想漱漱口，去掉嘴里的味道。

relativity

英 [?rel??t?v?ti] 美 [?rel??t?v?ti]

n. 相對論；相關(guān)性；相對性

例句：

According to the theory of relativity, nothing can travel faster than light.
根據(jù)相對論，任何東西都無法超越光速。

Einstein's theory of relativity won for him universal esteem.
愛因斯坦的相對論贏得了全世界對他的崇敬。

My colleague mentioned how the theory of relativity completely changed the field of physics.
我的同事提到了相對論如何徹底改變了物理學(xué)領(lǐng)域。

回顧

1. weak
2. null
3. transistor
4. rinse
5. relativity