Compared with grains , tubers are inherently more productive .

同谷类相比，块茎产量会更高。

Compared with grains tubers are inherently more productive .

与谷类相比，块茎天生高产。

There are no structural worries with tubers , which grow underground .

而块茎生长在地下，不存在这类问题。

Apart from contaminating the seeds , the bacteria get inside the stem tubers as the seeds begin to sprout .

除了污染种子外，大肠杆菌还会进入植物块茎内部，作为菌种准备萌发。

Their calorie mainly comes from sucrose forming the bulk of the sugars in tubers , accounting for more than 69 % of the total sugars .

这些卡路里主要来自于块茎当中形成大部分糖份的蔗糖，占总糖份的69%以上。