'S. Korea ups security for NK defectors after murder of Kim Jong-nam'
 With the North Korean ruler’s estranged half-brother killed in an apparent assassination, attention is now on the safety of Thae Yong-ho, one of the remaining high-profile critics of the ruthless Kim Jong-un.
 South Korea’s spy agency said Tuesday that it has heightened security for Thae, Pyongyang’s former deputy ambassador to the United Kingdom who defected to Seoul last August, following the killing last week of Kim Jong-nam.
* heightened: 높이다
* deputy: 부- (조직상 직급)
 The National Intelligence Service is also reportedly seeking to limit Thae’s public appearances out of concerns that the high-profile defector may be the North’s next target.
* reportedly: 전해진 바에 따르면 (report->수동태 reported->부사 reportedly)
* limit: 제한하다
* out of concern: ~를 우려해 (out of concern for (~를 위한 걱정)/out of concern that (~라는 우려))
Exports seen improving but conditions still challenging
 South Korea’s exports, the backbone of the country’s economy, seem on course to end their two-year losing streak this year.
* backbone: 척추 (지탱하는 중심)
* on course to: ~할 예정으로 보인다, 과정을 시작했다
* streak: 연속 (winning streak, losing streak 등)
 If they do, it will be a relief for Asia’s fourth-largest economy, whose exports plunged 5.9 percent on-year in 2016 and 7.9 percent in 2015, the country’s first two straight years of decline.
* be a relief: 안심시키다 (That's a relief! 다행이다!)
* plunge: 급락하다
* on-year: 전년대비
 Export data for the first several weeks of the year suggested a rosy start. In the first 20 days of February, exports soared 26.2 percent from a year ago, according to the Korea Customs Service on Tuesday. It was backed by strong performance in semiconductors, petrochemical products and automobiles, which also supported January’s 11 percent on-year growth.