did
... because后面接句子,because of后面接词。 did 难 (不规则动词表) because cause after/before when if 完整句 ...
Easy-Mover
难-牧(Easy-Mover)——当急担架设想
refugee ; IDPs ; The Boat People
tackling challenges ; work hard and overcome difficulties
内科 dyspnea ; Difficulty in Breathing ; exertional dyspnea ; Difficulty breathing
"难"是个多义词,它可以指难(汉字),难姓,难(魏歌歌演唱歌曲)。