1.自从十年前西式快餐进入中国之后，我们的饮食结构发生了巨大的变化。
Our dietary structure has undergone drastic changes since western fast food was introduced into China a decade ago.
1 易错点：当since译成“自从...以来，…已经....”
since+从句用一般过去时,+主句用现在完成时
2 易错点：