blackhead的复数形式怎么拼写？

n.黑头粉刺...

When these pores become blocked a whitehead or blackhead may develop.当毛孔被阻塞的情况下,就可能产生粟粒疹或黑头粉刺.Use as a daily cleanser to kill blackhead and breakout causing bacteria.使用作为日常清洁杀死黑头和分组致病细菌.It contains blackhead - cleaning e...

blackhead的音标：blackhead的英式发音音标为：['blækhed]blackhead的美式发音音标为：['blækˌhɛd]...