🧩 词语组成解析
river
['rivə]
n. 河，江;溪，巨流;
gum
[ɡʌm]
n. 口香糖;树胶;黏胶;牙龈;
vt.& vi. 胶合;涂以树胶;使…有粘性;
🗣️ 情景例句
Prices are always negotiable.
价钱总是可以商量的。
What's the population of China?
中国有多少人口？
It effectively spread the disease all over the continent and drastically reduced the rabbit population.
蚊子把这种疾病扩散到整个澳洲大陆，效果甚佳，结果兔子的数目大为减少。