He also argues that these people helped indian software companies break into the american market by vouching for their quality .

他还说，这些移民为印度的软件公司进行质量担保，帮助他们打入了美国市场。

Or we can look north to canada . It now requires a 28-day waiting period to buy a handgun , and it imposes a clever safeguard : gun buyers should have the support of two people vouching for them .

要不我们也可以看一下北方的加拿大，在那里买把手枪需要等上28天，而且你必须要有两个人为你做担保。