end sub释义：
终止子
例句：
In less-developed countries， such as those of sub-Saharan Africa and South-East Asia， wastage tends to occur primarily at the farmer-producer end of the supply chain.
在欠发达国家，如撒哈拉以南的非洲和东南亚国家，（食物）浪费往往主要发生在供应链的农民生产者端。
end if释义：
结束条件
例句：
The problems do not end if crocodiles successfully hatch from the eggs.
即使鳄鱼成功地从卵中孵化出来，问题也不会结束。
