Advice doesn't normally come cheap, but this piece is for free...
通常来说,忠告都是价值不菲的,但这个是免费赠送的。。。
So when a German buys something from a Japanese, or an Indian sells something to a Frenchman, they may all use English.
因此,当德国人从日本人那儿买东西时,或印度人把东西卖给法国人时,他们可能都用英语进行交流。