「那個月光，我永遠忘不了。」一九五九年，初赴美國留學的蔡振水從奧勒岡州波特蘭獨自搭上灰狗巴士，前往猶他州洛根。

“I’ll never forget that moonlight.” In 1959, newly arrived in America to study, Chen-Shui Tsai rode a Greyhound alone from Portland, Oregon, to Logan, Utah.

從庫車往拜城走，沿途盡是乾黃的山。快到克孜爾千佛洞時，路旁忽然立起兩排高大的白楊，樹冠在頭頂連成一條綠廊。