There is gum on the back of a stamp.

背面有胶水。

We seal the back of envelopes.

我们把信封背面封上。

Join the blue wool onto the end of the gold pattern and work the same stitches into the back.

在这金色图案边织上蓝毛线, 在背面也用同样方法来织。

Join the blue wool on the end of the gold pattern and work the same stitches into the back.

在这金制图案边织上蓝毛线, 在背面也用同样方法来织。

Antennae of B. tabaci are made up of scapus, pedicle and flagella that the latter consist of 1-5 segments and most of the antennal sensilla lie on its outer, upper and lower surfaces.

扫描电镜观察结果表明，烟粉虱由柄节、梗节和1～5节鞭节组成，绝大部分受器分布在背面、腹面和外侧面。