1. strain，(动植物的)种,品种。
eg:This strain of wheat can grow during a cold winter.
这种品系的小麦能在寒冷的春天生长。
2. hopefully是个副词，表示怀着希望地；hopefully也有但愿的意思，表示这意思时多用来修饰全句。
eg:Hopefully we will be there by six.
但愿我们能在六点之前赶到那儿。
3. iron out,消除。
eg:He was determined to iron out the difficulties.
他决心解决困难。
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