原文摘自每日英语听力“经济学人”栏目5.17内容。
Revenue from the iPhone continued to slow, falling by 17% in the first three months of the year compared with the same quarter in 2018;
the device accounts for an ever-smaller share of Apple's revenues.
Overall sales from China, where Apple faces stiff competition, were down by a fifth.
1.找主干
加粗部分为句子主干。
2.逐句看
Revenue from the iPhone continued to slow, falling by 17% in the first three months of the year compared with the same quarter in 2018;
主干：营收增速不断放缓。
什么营收？
from the iPhone（iPhone的营收）
放缓了多少？
falling by 17% in the first three months of the year compared with the same quarter in 2018（（营收）相比2018年一季度下降了17%。）
the device accounts for an ever-smaller share of Apple's revenues.
主干：该设备占有一部分。
什么的一部分？
of Apple's revenues（苹果公司营收的）
an ever-smaller（比以往任何时候都小的）
Overall sales from China, where Apple faces stiff competition, were down by a fifth.
主干：销量降低。
什么销量？
Overall（总的）
from China（中国市场的）
降低多少？
by a fifth（降低了五分之一）
为何中国市场销量降低那么多？
where Apple faces stiff competition（在这里，苹果公司面临激烈竞争）
stiff：艰难的；困难的
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