1.

Stem

1. 茎，干；词 [n.]
   The stem of the mushroom is broken.
   这个蘑菇梗折断了。
2. 制止，阻止，遏制 [v.]
   You must stem the flow of blood from the wound.
   你必须止住伤口流血。
3. 起源于 [v.]
   Your errors stem all from your carelessness.
   你犯的错误全都是由于你的粗心。

2.

step

1. 步，脚步 [n.]
   I took a step toward him.
   我朝他迈出了一步。
2. 台阶，阶梯 [n.]
   He hurried up the steps.
   他匆忙上台阶。
3. 步骤，措施 [n.]
   You must take every step to keep down expenses.
   你必须采取一切措施降低开支。
4. 踏，走，举步 [v.]
   He stepped out into the night.
   他走进暮色之中。

3.

Stern

1. 严厉的，严肃的，严格的 [adj.]
   a stern punishment
   严厉的惩罚
   —
   take stern measures
   采取严格措施
2. 船尾，飞机尾部 [n.]
   She seated herself in the stern.
   她在船尾的座位坐了下来。

4.

Anonymous [adj.]

1. 匿名的，无名的
   We received an anonymous letter.
   我们收到了一封匿名信。
2. 无特色的
   an anonymous composition
   一篇毫无特色的文章

5.

answer

1. 答复，答案，回答 [n.]
   I’ll send you an answer by telephone.
   我会打电话答复你。
2. 回答，响应 [v.]
   Henry took ages to answer the door.
   亨利拖拉了好久才去开门。
3. 适合 [v.]
   The power station, no bigger than a family house, could answer the need for electricity in many developing countries.
   这种与家庭住房一样小的发电站能满足许多发展中国家对电力的需求。
4. 负有责任，须作交代 [v.]
   answer for the consequences
   承担后果
   —
   Who do you answer to in your new job?
   你做的新工作要对谁负责？
5. 符合 [v.]
   The photograph answers to the description of the wanted man.
   这张照片与被通缉人相符。