A watermelon is red inside and green outside.
西瓜內紅外綠。
Oh, what a big watermelon!
喔唷，這么大的西瓜！
The watermelon has gotten bad.
西瓜婁了。
The pulp of this watermelon is too spongy.
這西瓜瓤?jì)禾饬恕?/p>
The prospects of this year's watermelon market are good.
今年的西瓜市場(chǎng)看好。