短语讲解：

1. Vietnam’s YouTube channel has debuted with "120 percent year-on-year growth in terms of watch time,” according to Phuong Anh Nguyen, a YouTube official.

in terms of 根据; 用…的话; 就…而言
例句：It can not be measured in terms of money.
这是不能用金钱衡量的。

2. Inexpensive data plans is one reason. Vietnamese own smartphones rather than laptop computers.

rather than （要） …而不…，与其…倒不如…
例句：We aim at quality rather than quantity.
我们的目的是重质不重量。