霜冻的危险过去后，在这个地区大约是在四月一日左右，我从苗圃买八棵西红柿苗。
When the danger of frost is past, which is about the first of April in this part of the country, I buy eight tomato plants from a nursery.
“霜冻”何时会给葡萄生产带来何种危险？请评估葡萄酒农可采用的不同类型的霜冻防护方法。
When and how does frost pose a risk to grape production? Evaluate the different methods of frost protection available to the grape grower.
尽管他们属于耐寒植物，但他们通常在危险的晚霜结束前开花，结果霜冻会使花死掉，导致减产。
Despite being frost-tolerant, they usually flower before the risk of a late frost is over and the flowers can die, reducing crops.
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