patchy
/ˈpætʃɪ; `pætʃɪ/ adj
(-ier, -iest)
1 existing in or having patches 有补丁的; 有斑或块的
patchy fog, mist, cloud, etc 团团的雾、 霭、 云等.
2 (fig 比喻) not of the same quality throughout; uneven 东拼西凑的; 质量不一致的; 不均匀的
a patchy essay, novel, performance 拼凑的文章、 小说、 演出
His work is rather patchy. 他的作品瑕瑜互见.
My knowledge of German is patchy, ie not complete. 我对德语一知半解.