这是一道词汇填空题，题目如下：
恒星诞生于无法触碰的气体和尘埃的云状漩涡中，但天体物理学家Nia Imara认为，这些结构对于研究人员来说并不是完全_____：她利用模拟数据和先进的3D打印技术去制作这些恒星孕育地的交互模型。
备选项：
A) regrettable
B) explicable
C) intangible
D) repeatable
正确答案：
C) intangible
TD SAT教研组注
intangible
adj.难以形容（或理解）的；不易度量的
that exists but that is difficult to describe, understand or measure
例句：
The old building had an intangible air of sadness about it.
那座旧建筑笼罩着一种说不出的悲凉气氛。
regrettable
adj.令人惋惜的；可惜的；令人遗憾的
that you are sorry about and wish had not happened
例句：
It is regrettable that the police were not informed sooner.
遗憾的是没有早些报警。
explicable
adj.可解释；可说明；可理解
that can be explained or understood
例句：
His behaviour is only explicable in terms of (= because of) his recent illness.
他的行为只能用他最近患病来解释。
repeatable
adj.可重复的
able to be repeated
例句：
I hope these results are repeatable.
我希望这些结果是可复验的。
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