卖方或买方国家商会出具的不可抗力证明书将作为不可抗力发生及持续时间的充分有效证据。

Certificate issued by respective Chamber of Commerce of the Sellers' or the Buyers' country shall be sufficient proof ot such contingencies and their duration.

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关于防晒霜是否能有效减少黑色素瘤，争议仍然存在——相较于预防其他皮肤癌，防晒霜能减少黑色素瘤的证据还不充分。

There is continuing debate as to how effective sunscreen is in reducing melanomas—the evidence is weaker than it is for preventing other types of skin cancer.

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临床经验和充分的实验证据表明理情行为疗法在减轻情绪痛苦时是有效甚至是高效的。

Clinical experience and a growing supply of experimental evidence show that REBT is effective and efficient at reducing emotional pain.

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