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Understandably, ...
用作句子副词，表达对所述情况的合理理解。
Understandably, he was upset.
可以理解，他很沮丧。
可理解地
先理解核心含义，再看它在真实句子里的用法。
可理解地
in a way that is easy to understand
Understandably, he was upset.
可以理解，他很沮丧。
由于容易理解或同情的原因
For reasons that are easy to understand or sympathise with.
以可理解的方式
In an understandable manner.
She was understandably upset after hearing the news.
她听到消息后很沮丧，这是可以理解的。
The instructions were written clearly and were understandably easy to follow.
说明书写得很清楚，易懂易跟。
Given the complexity of the topic, the students' confusion was understandably high.
考虑到主题的复杂性，学生们的困惑程度高是可以理解的。
用作句子副词，表达对所述情况的合理理解。
Understandably, he was upset.
可以理解，他很沮丧。
She reacted understandably.
她的反应可以理解。
Not this
His reaction was understandably.
Use this
His reaction was understandable.
错误：将副词 understandably 误用作表语形容词。正确用法：在系动词后应用形容词 understandable 作表语。
Not this
She was understandly upset.
Use this
She was understandably upset.
错误：拼写错误，误写为 understandly。正确形式为 understandably，副词修饰形容词 upset。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
可理解地紧张
She was understandably nervous before her first flight.
她在第一次飞行前可理解地紧张。
可理解地不安
He was understandably upset after losing his job.
他在失业后可理解地不安。
可理解地谨慎
Investors are understandably cautious about the volatile market.
投资者对动荡的市场可理解地谨慎。
可理解地生气
The customers were understandably angry about the delay.
顾客对延误可理解地生气。
可理解地担忧
Parents are understandably concerned about their children's safety.
父母对孩子的安全可理解地担忧。
我很生气，这可以理解。
The character, understandably, felt betrayed.
这个角色感到被背叛，这是可以理解的。
Use understandably naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
理解（understand）加 -ably 表示‘可…地’，所以是‘可理解地’。
语域：neutral 常见场景：formal discourse、casual conversation 通常用于正式或书面语，但在日常对话中也较常见。
常用于句首，表示说话人的态度，意为'可以理解地'。
Dictionary facts from ECDICT, WIKTIONARY.