1
crucially + adj.
crucially 修饰形容词，相当于 extremely，表示“极其”“非常”。
This decision is crucially important to the company's future.
这一决定对公司的未来至关重要。
至关重要地；关键地
先理解核心含义，再看它在真实句子里的用法。
至关重要地；关键地
to a crucial degree
This decision is crucially important to the company's future.
这一决定对公司的未来至关重要。
关键地
In a crucial manner.
Crucially, the plan must be tested before we launch it.
至关重要的是，这个计划必须在我们启动前进行测试。
This step is crucially important for the success of the project.
这一步对项目的成功至关重要。
The results depend crucially on the quality of the data.
结果关键地取决于数据的质量。
crucially 修饰形容词，相当于 extremely，表示“极其”“非常”。
This decision is crucially important to the company's future.
这一决定对公司的未来至关重要。
用作句子副词，置于句首，强调整个句子的内容很重要。
Crucially, the vaccine is safe for children.
关键的是，这种疫苗对儿童是安全的。
Not this
It is crucially that we act now.
Use this
It is crucial that we act now.
系动词 be 后面需要形容词作表语，而 crucially 是副词，不能直接作表语；应改用形容词 crucial。这样句子结构才正确，意思仍为“我们现在行动至关重要”。
Not this
This is a crucially decision.
Use this
This is a crucial decision.
名词 decision 前面需要形容词来修饰，crucially 是副词，不能修饰名词；应改用形容词 crucial，放在名词前作定语，表示“关键的决定”。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
至关重要
This step is crucially important for the success of the project.
这一步对项目的成功至关重要。
关键取决于
The outcome crucially depends on how well we prepare.
结果关键取决于我们准备得如何。
关键性地不同
The two approaches are crucially different in their assumptions.
这两种方法在假设上有着关键性的不同。
更为关键的是
More crucially, we need to address the root cause.
更为关键的是，我们需要解决根本原因。
紧密相关
Economic growth is crucially linked to education.
经济增长与教育密切相关。
Use crucially naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
由 crucial（关键的）+ ly 构成副词；联想“关键时刻”可至关重要，crucially 就是“至关重要地、关键地”。
语域：neutral 常见场景：academic writing、formal presentations 该词为副词，表示“至关重要地”，通常用于强调某一点的重要性，多出现在正式书面语和正式演讲中；在日常对话中也可使用，但语气相对正式。
没有与 /ˈkruːʃɪəli/ 完全押韵的常用词。crucial 与它开头相同 /ˈkruːʃ/，但结尾是 /əl/。cruelly 拼写相近，读作 /ˈkruːəli/，注意不要混淆。especially、socially、officially、specially 都以 -cially 结尾，读作 /ʃəli/，但重读元音各不相同（/ɛ/、/əʊ/、/ɪ/、/ɛ/）。
Dictionary facts from ECDICT, WIKTIONARY.