| 单词 | flu strain | 
| 释义 | flu strain With each outbreak, experts rush to match a vaccine to the particular flu strain.  Smithsonian Mag  It protects against the dominant flu strain in circulation and has a shelf life until the end of this year.  The Sun  Nothing will more rapidly aid a resistant flu strain to be widespread this winter.  Times, Sunday Times  With a mutant flu strain taking infections to a four-year high, there are fears that nonurgent operations and tests could be cancelled if it becomes a large-scale outbreak.  Times, Sunday Times  For instance, government might order mass vaccination with a pre-pandemic flu strain.  Times, Sunday Times   | 
	
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