Shell has still not been able to say why the leak occurred in the first place.
壳牌仍未能说清为何泄漏在第一处发生。
Despite the signs of improvement, the housing market is still a shell of what it was during headier times.
尽管出现好转迹象，但美国住房市场仍然远远低于此前热潮时期的水平。
The egg develops its shell while still inside the mother.
还在母体中的时候，卵就已经发育出外壳了；
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