1. He made a rigorous study of the plants in the area.
    他对该地的植物进行了慎密的研究。

1. 严格的：包含了:持续促进社会安康,扩大与深入社会的智慧、文化与美学成就;对於过往采取严格的(rigorous)、承担的(sustained)、批判的(critical)评估(evaluations),社会当前与可能的未来;对於学习的各种分枝承诺进行最高标准的研究;

2. 严密的：[摘要] 20世纪末,后现代主义思潮影响下,美国教育学者小威廉姆提出了四R课程理论[即丰富的(rich)、回归的(recursive)关联的(relational)和严密的(rigorous)].

3. 苛刻：颗粒级配理论 theory of granulartity | 苛刻 rigorous | 可变形粒子 deformation particle

4.

4. 严格的; 严肃的; 严厉的：aspect 模样;面貌 | rigorous 严格的; 严肃的; 严厉的 | vigorous 精力充沛的;精神饱满的

1. (测试、系统或程序)严格的，严密的，缜密的
    A test, system, or procedure that is rigorous is very thorough and strict.

    e.g. The selection process is based on rigorous tests of competence and experience.
           选拔过程是基于对能力和经验的严格测试。
    e.g. ...a rigorous system of blood analysis.
           缜密的血液分析系统

2. 一丝不苟的;严格的;谨慎的
    If someone is rigorous in the way that they do something, they are very careful and thorough.

    e.g. He is rigorous in his control of expenditure.
           他对支出控制得非常严格。

1. demanding strict attention to rules and procedures

    e.g. rigorous discipline
           tight security
           stringent safety measures

    Synonym: stringenttight

2. rigidly accurate
    allowing no deviation from a standard

    e.g. rigorous application of the law
           a strict vegetarian

    Synonym: strict