究竟是health problem还是healthy problem?是填形容词还是填,名词?

究竟是health problem还是healthy problem?是填形容词还是填,名词? 英语翻译health problem 还是healthy problem 为什么 simple _____ problem(填health还是healthy)答案是health，I want to know why 【英语】健康问题 的英文是healthy problem还是health problem?健康问题 的英文是healthy problem还是health problem?为什么 ? 这些属于什么语法内容?网上翻译的两种都有... health是名词还是形容词? 兰新铁路第二双线的设计时速究竟是多少,是200km/h?250km/h?还是350km/h? health problem为什么不用healthy 究竟男人是奇怪的生物还是女人?W H Y > 是have problem with还是have a problem with 是problem with sth ,还是problem about sth? 是stay health还是stay healthy? 究竟是水蒸汽 还是水蒸气? 究竟是液化还是熔化 究竟是助桀为虐,还是助纣为虐? the problem now is that i have lots of problem【】 to ask是problem还是problems 阳离子放电顺序究竟是：Ag＋＞Hg2＋＞Cu2＋＞H＋＞Fe2＋＞Zn2＋还是这个顺序Ag+＞Fe3+＞Cu2+＞Fe2+＞Zn2+＞H+＞Al3+＞Mg2+H+究竟在Fe2＋前面还是后面?麻烦解释一下H+究竟在Fe2＋前面还是后面? health 和healthy的用法keep health 还是 keep healthy?是 stay health 还是stay healthy?哪个正确? problem是可数还是不可数名词