这是个薄薄的无带皮包，用非常光滑、黑巧克力色的鳄鱼皮制成，大约是三本护照并排起来那么大。
It was a thin clutch, fashioned from very glossy, dark chocolate-coloured crocodile skin, about the size of three passports lined up in a row.
提出了求解一类带一般凸约束的复合非光滑优化的信赖域算法。
In this paper, we propose a new trust region algorithm for solving a class of composite nonsmooth optimization subject to convex constraints.
我们的飞行员拉姆，带我们悄悄地下到一个山谷里，这个山谷靠近一个由光滑的黑岩石形成的悬崖。
Lam, our pilot, brought us down gently in a valley close to a great cliff of smooth, black rock.
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