平上去入的英文：
level tone, falling-rising tone, falling tone, and entering tone -- the four tones in classical Chinese phonetics

level是什么意思：
n. 水平线，水平面；高度；层；水平；级别
adj. 水平的，同高度的；笔直的；平静的
v. 推平；毁坏；使平等；瞄准；变平；坦率诚实地对待

Level off the shelves with a spirit level.
用酒精水平仪把架子弄平。

But there is plenty of scope at that level.
然而在此水平上还是有足够的余地。

The worker levelled their looks at the foreman.
工人们用目光逼视着工头。

tone是什么意思：
n. 音调，音色；语气；全音；色调；健康状态
v. 呈现悦目色调；调和；带有某种腔调；定调；增强；使更健壮

The progression of a dissonant tone or chord to a consonant tone or chord.
解决不谐和的音调或和弦向和谐的音调或和弦的过渡

A tone in the harmonic series of overtones produced by a fundamental tone.
泛音指由一种基本的声音所产生的一系列和谐的泛音中的声音

And will talk in contemptuous tones of the Shark.
它洋洋得意地同鲨鱼攀谈。

falling是什么意思：
n. 落下；堕落
adj. 落下的；跌倒的

Sleet is falling.
天上下起了冰雹。

fall into disfavour
失宠失众望

We observed the barometer fall. [The barometer was observed to fall.]
我们看见晴雨表下降。