请问你可以帮我分析：The first step is to undersding the organism中under

请问你可以帮我分析：The first step is to undersding the organism中under It is the first step that is diffcult to take It is the first step that is difficult to take. It is the first step that is difficult to take The first step is the only difficulty The first中间可以加形容词吗?比如 the very important first step is . it is the necessary to take the first step to begin the ( ) The first step is alwaysthe handest It is the first step that cost 托福英语句子分析The first step in phytoremediation is the planting o The first step that should be taken is to improve the living Confidence in yourself is the first step on the road to succ