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1.This first launched in the USA and has since expanded to 35 countries worldwide.
expand to扩展到…
The menu will expand to show four preset positions and preset 1 will automatically be highlighted.
此菜单会展开显示四个预置位置，预置1将自动变高亮。
2.Smart programs that focus on teen driving behavior have been very successful in helping novice and younger drivers be safer on the roads, but we still have more to do.
focus on致力于；使聚焦于
They focus on overt discrimination rather than insidious aspects of racism.
他们关注的是公开的歧视，而不是种族主义的一些潜在问题。
