mothball的一般过去时怎么写

n.卫生球，樟脑球vt.封存adj.后备的...

mothball的现在进行时为：mothballing...

mothball的音标：mothball的英式发音音标为：['mɒθbɔ:l]mothball的美式发音音标为：['mɔθbɔl]...

mothball的第三人称单数（三单）为：mothballs...

mothball的现在完成时为：mothballed...

mothball的复数形式为：mothballs...

Our country population is numerous, per capita has farmland amount low, and mothball resource lack.我国人口众多, 人均占有耕地数量低, 且后备资源缺乏....