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1·The main stem will extend to around 12 ft, if left to develop naturally.

如果让其自然生长，主干会延伸到12英尺左右。《柯林斯英汉双解大词典》

2·It. s the lateral shoot from the main stem of a plant.

这是分枝植株的主茎上长出的侧枝。

3·Cut the main stem about 12 to 15 centimeters below the head.

在菜尖下方12 - 15厘米处把主茎割断就可以了。

4·A tree is a tall, woody plant that usually has one main stem, or trunk.

树是一种高大的木本植物，通常有一根主干，或树干。

5·The backup seal is secondary to the main stem seal assembly (20) in the bonnet (12).

备用密封件是阀帽(12)内主阀杆密封组件(20)的二级密封。

6·Finalleaf number on main stem could be a reliable measure for wheat vernalization response.

主茎总叶数的变化是量测小麦春化反应性的一个可靠指标。

7·Subsequent growth of some of the axillaries results in first-order branching of the main stem.

一些腋芽继续生长形成主茎的第一级分枝。

8·There was a good corresponding relationship between the main stem leafing and the spike differentiation.

主茎出叶与穗分化有良好对应关系。

9·But we can examine here the mother fallacy that has given birth to this progeny, the main stem of the network.

但是我们能研究研究下这个体系中衍生其他谬论分支的主谬论，即整个谬论网络体系的主干。

10·The new research shows that the buds on the side cannot export their auxin into the main stem because it is too full.

这项新的研究显示侧边的芽体无法将它们的茁长素输送到主茎秆是因为主干内太过饱和了。

干线

1·It is always a tough issue for both our road management department and theory field that how to solve the problem of investment and financing of common main stem road.

如何解决普通干线公路的投融资问题，是一直困扰着我国公路主管部门和理论界的难题。