certain的副词是certainly。adv. 肯定; 当然; 无疑; 确定;
例句：It is certainly worth checking up on your benefit entitlements. 查清楚你可以享受哪些福利是绝对有必要的。
扩展资料
例句：
Certain of those present were unwilling to discuss the matter further.
某些在场的'人不愿意进一步讨论这个问题。
Those beliefs still prevail among certain social groups.
这些信念在某些社会群体中仍很盛行。
The work must be completed within a certain time limit.
这项工作必须在一定期限内完成。
The companys financial position is not certain.
这家公司的财务状况不明朗。
Many animals breed only at certain times of the year.
很多动物只在一年的某个时候繁殖。
