It was a difficult time, but essential in terms of gaining the experience she needed.
空格后面说的是这段时间很困难，但是对获得所需要的经验却是很有必要的。
Shipping shaft system alignment is essential to ensuring the long-terms reliable operation of shaft.
船舶轴系合理校中对保证轴系长期可靠运转极为重要。
Some explanation of terms and concepts is likely to be helpful, and perhaps even essential.
解释一些术语和概念(这些可能是最基本的)可能会有帮助。
Some explanation of terms and concepts is likely to be helpful, and perhaps even essential.
解释一些术语和概念(这些可能是最基本的)可能会有帮助。
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