for fear that，lest ；

[例句] 他们低声耳语惟恐被人听见. They spoke in whispers lest they should be heard.

[例句] 我惟恐自己再迟到. I feared lest I should be late again.

[医]unique ；

[例句] 日光透过玻璃屋顶照入; 眼下这是室内惟一的照明. Daylight came in through its glass roof; this was now the only illumination.

[例句] 除了当俘虏之外,惟一的选择就是奋战至死了. The only alternative to being taken prisoner was to die fighting.

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